CCM.MK2, EUROMET.M.MK2, EUROMET.M.MK2.1, APMP.M.MK2, EURAMET.M.MK2.3, and EURAMET.M.MK2.5
MEASURAND : Mass
NOMINAL VALUE : 10 kg
Degrees of equivalence: D_{i} and expanded uncertainty U_{i} (at a 95 % level of confidence) expressed in mg: Click here to view the Graph of equivalence
CCM.MK2, APMP.M.MK6, EUROMET.M.MK2, EUROMET.M.MK2.1,
APMP.M.MK2, APMP.M.MK2.1, EURAMET.M.MK2.2,
EURAMET.M.MK2.3, and EURAMET.M.MK2.6
MEASURAND : Mass
NOMINAL VALUE : 500 g
Degrees of equivalence: D_{i} and expanded uncertainty U_{i} (at a 95 % level of confidence) expressed in mg: Click here to view the Graph of equivalence
CCM.MK2, APMP.M.MK6, EUROMET.M.MK2, EUROMET.M.MK2.1, APMP.M.MK2, APMP.M.MK2.1, EURAMET.M.MK2.2,
EURAMET.M.MK2.3, and EURAMET.M.MK2.6
MEASURAND : Mass
NOMINAL VALUE : 20 g
Degrees of equivalence: D_{i} and expanded uncertainty U_{i} (at a 95 % level of confidence) expressed in mg: Click here to view the Graph of equivalence
CCM.MK2, APMP.M.MK6, EUROMET.M.MK2, EUROMET.M.MK2.1,
APMP.M.MK2, APMP.M.MK2.1, EURAMET.M.MK2.2,
and EURAMET.M.MK2.6
MEASURAND : Mass
NOMINAL VALUE : 2 g
Degrees of equivalence: D_{i} and expanded uncertainty U_{i} (at a 95 % level of confidence) expressed in mg: Click here to view the Graph of equivalence
CCM.MK2, APMP.M.MK6, EUROMET.M.MK2, EUROMET.M.MK2.1,
APMP.M.MK2, APMP.M.MK2.1, EURAMET.M.MK2.2,
and EURAMET.M.MK2.6
MEASURAND : Mass
NOMINAL VALUE : 100 mg
Degrees of equivalence: D_{i} and expanded uncertainty U_{i} (at a 95 % level of confidence) expressed in mg: Click here to view the Graph of equivalence
CCM.MK2, EUROMET.M.MK2, EUROMET.M.MK2.1, APMP.M.MK2, EURAMET.M.MK2.3, and EURAMET.M.MK2.5
MEASURAND : Mass
NOMINAL VALUE : 10 kg
Degrees of equivalence: D_{i} and expanded uncertainty U_{i} (at a 95 % level of confidence) expressed in mg
In dark blue: laboratories participant in CCM.MK2
In green: laboratories participant in EUROMET.M.MK2
In orange: laboratories participant in EUROMET.M.MK2.1
In pink: laboratories participant in APMP.M.MK2
In purple: laboratory participant in EURAMET.M.MK2.3
In blue: laboratories participant in EURAMET.M.MK2.5
Results are presented under A4 printable format in Summary Results (PDF file).
CCM.MK2, APMP.M.MK6, EUROMET.M.MK2, EUROMET.M.MK2.1, APMP.M.MK2, APMP.M.MK2.1, EURAMET.M.MK2.2,
EURAMET.M.MK2.3, and EURAMET.M.MK2.6
MEASURAND : Mass
NOMINAL VALUE : 500 g
Degrees of equivalence: D_{i} and expanded uncertainty U_{i} (at a 95 % level of confidence) expressed in mg
In dark blue: laboratories participant in CCM.MK2
In blue: laboratories participant in APMP.M.MK6
In green: laboratories participant in EUROMET.M.MK2
In orange: laboratories participant in EUROMET.M.MK2.1
In pink: laboratories participant in APMP.M.MK2
In braun: laboratory participant in APMP.M.MK2.1
In grey: laboratories participant in EURAMET.M.MK2.2
In purple: laboratory participant in EURAMET.M.MK2.3
In black: laboratory participant in EURAMET.M.MK2.6
Results are presented under A4 printable format in Summary Results (PDF file).
CCM.MK2, APMP.M.MK6, EUROMET.M.MK2, EUROMET.M.MK2.1, APMP.M.MK2, APMP.M.MK2.1, EURAMET.M.MK2.2,
EURAMET.M.MK2.3, and EURAMET.M.MK2.6
MEASURAND : Mass
NOMINAL VALUE : 20 g
Degrees of equivalence: D_{i} and expanded uncertainty U_{i} (at a 95 % level of confidence) expressed in mg
In dark blue: laboratories participant in CCM.MK2
In blue: laboratories participant in APMP.M.MK6
In green: laboratories participant in EUROMET.M.MK2
In orange: laboratories participant in EUROMET.M.MK2.1
In pink: laboratories participant in APMP.M.MK2
In braun: laboratory participant in APMP.M.MK2.1
In grey: laboratories participant in EURAMET.M.MK2.2
In purple: laboratory participant in EURAMET.M.MK2.3
In black: laboratory participant in EURAMET.M.MK2.6
Results are presented under A4 printable format in Summary Results (PDF file).
CCM.MK2, APMP.M.MK6, EUROMET.M.MK2, EUROMET.M.MK2.1,
APMP.M.MK2, APMP.M.MK2.1, EURAMET.M.MK2.2,
and EURAMET.M.MK2.6
MEASURAND : Mass
NOMINAL VALUE : 2 g
Degrees of equivalence: D_{i} and expanded uncertainty U_{i} (at a 95 % level of confidence) expressed in mg
In dark blue: laboratories participant in CCM.MK2
In blue: laboratories participant in APMP.M.MK6
In green: laboratories participant in EUROMET.M.MK2
In orange: laboratories participant in EUROMET.M.MK2.1
In pink: laboratories participant in APMP.M.MK2
In braun: laboratory participant in APMP.M.MK2.1
In grey: laboratories participant in EURAMET.M.MK2.2
In black: participant in EURAMET.M.MK2.6
Results are presented under A4 printable format in Summary Results (PDF file).
CCM.MK2, APMP.M.MK6, EUROMET.M.MK2, EUROMET.M.MK2.1,
APMP.M.MK2, APMP.M.MK2.1, EURAMET.M.MK2.2,
and EURAMET.M.MK2.6
MEASURAND : Mass
NOMINAL VALUE : 100 mg
Degrees of equivalence: D_{i} and expanded uncertainty U_{i} (at a 95 % level of confidence) expressed in mg
In dark blue: laboratories participant in CCM.MK2
In blue: laboratories participant in APMP.M.MK6
In green: laboratories participant in EUROMET.M.MK2
In orange: laboratories participant in EUROMET.M.MK2.1
In pink: laboratories participant in APMP.M.MK2
In braun: laboratory participant in APMP.M.MK2.1
In grey: laboratories participant in EURAMET.M.MK2.2
In black: participant in EURAMET.M.MK2.6
Results are presented under A4 printable format in Summary Results (PDF file).
Metrology area, Subfield  Mass and related quantities, Mass Standards 
Description  Comparison of mass standards 
Time of measurements  1998  1999 
Status  Approved for equivalence 
Final Reports of the comparisons  
Measurand  Mass: 100 mg, 2 g, 20 g, 500 g and 10 kg 
Transfer device  Stainless steel standards 
Comparison type  Key Comparison 
Consultative Committee  CCM (Consultative Committee for Mass and Related Quantities) 
Conducted by  CCM (Consultative Committee for Mass and Related Quantities) 
Comments  This comparison has been classified as superseded by the CCM and was placed in the KCDB archives on 6 January 2016. Results published on 25 November 2003 Comparison of multiples and submultiples of the kilogram APMP.M.MK6, APMP.M.MK2.1, EURAMET.M.MK2.2, EURAMET.M.MK2.3 and EURAMET.M.MK2.6 results are linked to those of CCM.MK2 for nominal values 500 g, 20 g, 2 g, and 100 mg.

Pilot institute 
PTB
PhysikalischTechnische Bundesanstalt Germany 
Contact person  M. Gläser +49 (0) 531 592 1110 
Pilot laboratory  

PTB 
PhysikalischTechnische Bundesanstalt, Germany, EURAMET 
CENAM 
Centro Nacional de Metrologia, Mexico, SIM 
KRISS 
Korea Research Institute of Standards and Science, Korea, Republic of, APMP 
METAS 
Federal Institute of Metrology, Switzerland, EURAMET 
NIM 
National Institute of Metrology, China, APMP 
NIST 
National Institute of Standards and Technology, United States, SIM 
NMIJ AIST 
National Metrology Institute of Japan, Japan, APMP 
NPL 
National Physical Laboratory, United Kingdom, EURAMET 
NRC 
National Research Council, Canada, SIM 
SMU 
Slovensky Metrologicky Ustav, Slovakia, EURAMET 
This page proposes printout on A4 paper (portrait) of the comparison details (best printed out using a black and white printer).
Please, select items to be printed out, then click on "OK" :
CCM.MK2, EUROMET.M.MK2, EUROMET.M.MK2.1, APMP.M.MK2, EURAMET.M.MK2.3, and EURAMET.M.MK2.5
MEASURAND : Mass
NOMINAL VALUE : 10 kg
The key comparison reference value, x_{R}, is evaluated as the median of the x_{i} values. Its standard uncertainty is denoted u_{R}, see Appendix 1 of the CCM.MK2 Final Report. x_{R} = 0.03 mg and u_{R} = 0.12 mg 
The degree of equivalence of each laboratory with respect to the reference value is given by a pair of terms: D_{i} = (x_{i}  x_{R}) and U_{i}, its expanded uncertainty (at a 95% level of confidence), both expressed in mg. Detailed information on the evaluation of U_{i} may be found in Section 5 of the CCM.MK2 Final Report. 
The degree of equivalence between two laboratories is given by a pair of terms: D_{ij} = D_{i}  D_{j} = (x_{i}  x_{j}) and U_{ij}, its expanded uncertainty (at a 95% level of confidence), both expressed in mg. Detailed information on the evaluation of U_{ij} may be found in Section 6 of the CCM.MK2 Final Report. 
The linking process is explained in Appendix A of the EUROMET.M.MK2 Final Report.
he degree of equivalence of each laboratory i participant in EUROMET.M.MK2 with respect to the CCM.MK2 key comparison reference value is given by a pair of terms: D_{i} and U_{i}, its expanded uncertainty (at a 95% level of confidence), both expressed in mg. These are computed as explained in Appendix A of the EUROMET.M.MK2 Final Report. 
The degrees of equivalence between any of the laboratories participating in EUROMET.M.MK2 and those participating in CCM.MK2 are not computed. The pairwise degrees of equivalence inside EUROMET.M.MK2 are given in Table 6 to 10 of the EUROMET.M.MK2 Final Report. 
The linking process is explained in Appendix A of the EUROMET.M.MK2.1 Final Report.
The degree of equivalence of each laboratory i participant in EUROMET.M.MK2.1 with respect to the CCM.MK2 key comparison reference value is given by a pair of terms: D_{i} and U_{i}, its expanded uncertainty (at a 95% level of confidence), both expressed in mg. These are computed as explained in Appendix A of the EUROMET.M.MK2.1 Final Report. 
The degrees of equivalence between any of the laboratories participating in EUROMET.M.MK2.1 and those participating in CCM.MK2 are not computed. The pairwise degrees of equivalence inside EUROMET.M.MK2.1 are given in Table 7 to 11 of the EUROMET.M.MK2.1 Final Report. 
The linking process is explained in section 7.3 of the APMP.M.MK2 Final Report.
The degree of equivalence of each laboratory i participant in APMP.M.MK2 with respect to the CCM.MK2 key comparison reference value is given by a pair of terms: D_{i} and U_{i}, its expanded uncertainty (k = 2), both expressed in mg. These are computed as explained in section 7.3 of the APMP.M.MK2 Final Report. 
The degrees of equivalence between two laboratories participating in APMP.M.MK2 is given by a pair of terms both expressed in mg: D_{ij} = D_{i } D_{j}, and its expanded uncertainty (k = 2) U_{ij}. The pairwise degrees of equivalence between any of the laboratories participating in APMP.M.MK2 and those participating in CCM.MK2 are not computed. 
The link is made through the EUROMET.M.MK2 key comparison using EIM results in both comparisons (see Section 7 of the EURAMET.M.MK2.3 Final Report).
The pairwise degrees of equivalence inside EURAMET.M.MK2.3 are given in Table 5 of the EURAMET.M.MK2.3 Final Report. 
The link is made through the results of the PTB having participated in both comparisons CCM.MK2 and EURAMET.M.MK2.5
(see page 6 of the EURAMET.M.MK2.5 Final Report).
No pairwise degrees of equivalence involving EURAMET.M.MK2.5 participants have been computed. 
CCM.MK2, APMP.M.MK6, EUROMET.M.MK2, EUROMET.M.MK2.1, APMP.M.MK2, APMP.M.MK2.1, EURAMET.M.MK2.2,
EURAMET.M.MK2.3, and EURAMET.M.MK2.6
MEASURAND : Mass
NOMINAL VALUE : 500 g
The key comparison reference value, x_{R}, is evaluated as the median of the x_{i} values. Its standard uncertainty is denoted u_{R}, see Appendix 1 of the CCM.MK2 Final Report. x_{R} = 0.005 mg and u_{R} = 0.004 mg 
The degree of equivalence of each laboratory with respect to the reference value is given by a pair of terms: D_{i} = (x_{i}  x_{R}) and U_{i}, its expanded uncertainty (at a 95% level of confidence), both expressed in mg. Detailed information on the evaluation of U_{i} may be found in Section 5 of the CCM.MK2 Final Report. 
The degree of equivalence between two laboratories is given by a pair of terms: D_{ij} = D_{i}  D_{j} = (x_{i}  x_{j}) and U_{ij}, its expanded uncertainty (at a 95% level of confidence), both expressed in mg. Detailed information on the evaluation of U_{ij} may be found in Section 6 of the CCM.MK2 Final Report. 
The APMP.M.MK6 results were analyzed and linked to the CCM.MK2 results using Generalised LeastSquares (sometimes known as GaussMarkov) estimation (see Section 7 of the APMP.M.MK6 Final Report). 
 the degree of equivalence of each laboratory participant in APMP.M.MK6 with respect to the CCM.MK2 key comparison reference value, D_{i} and U_{i}, and 
 the degrees of equivalence between two laboratories both participant in APMP.M.MK6, D_{ij} and U_{ij}, U_{i} and U_{ij} being the expanded uncertainties (k = 2) of D_{i} and D_{ij} respectively. The pairwise degrees of equivalence inside APMP.M.MK6 are given on pages 15 and 16 of the APMP.M.MK6 Final Report. 
Artefacts of nominal value 1 kg are also measured in the framework of key comparison APMP.M.MK6. This is reported together with CCM.MK1 results.
The linking process is explained in Appendix A of the EUROMET.M.MK2 Final Report.
The degree of equivalence of each laboratory i participant in EUROMET.M.MK2 with respect to the CCM.MK2 key comparison reference value is given by a pair of terms: D_{i} and U_{i}, its expanded uncertainty (at a 95% level of confidence), both expressed in mg. These are computed as explained in Appendix A of the EUROMET.M.MK2 Final Report. 
The degrees of equivalence between any of the laboratories participating in EUROMET.M.MK2 and those participating in CCM.MK2 are not computed. The pairwise degrees of equivalence inside EUROMET.M.MK2 are given in Table 6 to 10 of the EUROMET.M.MK2 Final Report. 
The linking process is explained in Appendix A of the EUROMET.M.MK2.1 Final Report.
The degree of equivalence of each laboratory i participant in EUROMET.M.MK2.1 with respect to the CCM.MK2 key comparison reference value is given by a pair of terms: D_{i} and U_{i}, its expanded uncertainty (at a 95% level of confidence), both expressed in mg. These are computed as explained in Appendix A of the EUROMET.M.MK2.1 Final Report. 
The degrees of equivalence between any of the laboratories participating in EUROMET.M.MK2.1 and those participating in CCM.MK2 are not computed. The pairwise degrees of equivalence inside EUROMET.M.MK2.1 are given in Table 7 to 11 of the EUROMET.M.MK2.1 Final Report. 
The linking process is explained in section 7.3 of the APMP.M.MK2 Final Report.
The degree of equivalence of each laboratory i participant in APMP.M.MK2 with respect to the CCM.MK2 key comparison reference value is given by a pair of terms: D_{i} and U_{i}, its expanded uncertainty (k = 2), both expressed in mg. These are computed as explained in section 7.3 of the APMP.M.MK2 Final Report. 
The degrees of equivalence between two laboratories participating in APMP.M.MK2 is given by a pair of terms both expressed in mg: D_{ij} = D_{i } D_{j}, and its expanded uncertainty (k = 2) U_{ij}. The pairwise degrees of equivalence between any of the laboratories participating in APMP.M.MK2 and those participating in CCM.MK2 are not computed. 
The linking process is explained in section 6.2 of the APMP.M.MK2.1 Final Report.
The degree of equivalence of each laboratory i participant in APMP.M.MK2.1 with respect to the CCM.MK2 key comparison reference value is given by a pair of terms: D_{i} and U_{i}, its expanded uncertainty (k = 2), both expressed in mg. These are computed as explained in section 6.2 of the APMP.M.MK2.1 Final Report. 
No pairwise degrees of equivalence involving APMP.M.MK2.1 participants have been computed. 
The link is made through the EUROMET.M.MK2 key comparison using BEV and EIM results in both comparisons (see Section 5 of the EURAMET.M.MK2.2 Final Report).
No pairwise degrees of equivalence involving EURAMET.M.MK2.2 participants have been computed. 
The link is made through the EUROMET.M.MK2 key comparison using EIM results in both comparisons (see Section 7 of the EURAMET.M.MK2.3 Final Report).
The pairwise degrees of equivalence inside EURAMET.M.MK2.3 are given in Table 5 of the EURAMET.M.MK2.3 Final Report. 
The link is made through the results of NPL having participated in both comparisons (see Section 4 of the EURAMET.M.MK2.6 Final Report).
No pairwise degrees of equivalence involving EURAMET.M.MK2.6 participants have been computed. 
CCM.MK2, APMP.M.MK6, EUROMET.M.MK2, EUROMET.M.MK2.1, APMP.M.MK2, APMP.M.MK2.1, EURAMET.M.MK2.2,
EURAMET.M.MK2.3, and EURAMET.M.MK2.6
MEASURAND : Mass
NOMINAL VALUE : 20 g
The key comparison reference value, x_{R}, is evaluated as the median of the x_{i} values. Its standard uncertainty is denoted u_{R}, see Appendix 1 of the CCM.MK2 Final Report. x_{R} = 0.0027 mg and u_{R} = 0.0011 mg 
The degree of equivalence of each laboratory with respect to the reference value is given by a pair of terms: D_{i} = (x_{i}  x_{R}) and U_{i}, its expanded uncertainty (at a 95% level of confidence), both expressed in mg. Detailed information on the evaluation of U_{i} may be found in Section 5 of the CCM.MK2 Final Report. 
The degree of equivalence between two laboratories is given by a pair of terms: D_{ij} = D_{i}  D_{j} = (x_{i}  x_{j}) and U_{ij}, its expanded uncertainty (at a 95% level of confidence), both expressed in mg. Detailed information on the evaluation of U_{ij} may be found in Section 6 of the CCM.MK2 Final Report. 
The APMP.M.MK6 results were analyzed and linked to the CCM.MK2 results using Generalised LeastSquares (sometimes known as GaussMarkov) estimation (see Section 7 of the APMP.M.MK6 Final Report). 
 the degree of equivalence of each laboratory participant in APMP.M.MK6 with respect to the CCM.MK2 key comparison reference value, D_{i} and U_{i}, and 
 the degrees of equivalence between two laboratories both participant in APMP.M.MK6, D_{ij} and U_{ij}, U_{i} and U_{ij} being the expanded uncertainties (k = 2) of D_{i} and D_{ij} respectively. The pairwise degrees of equivalence inside APMP.M.MK6 are given on pages 15 and 16 of the APMP.M.MK6 Final Report. 
Artefacts of nominal value 1 kg are also measured in the framework of key comparison APMP.M.MK6. This is reported together with CCM.MK1 results.
The linking process is explained in Appendix A of the EUROMET.M.MK2 Final Report.
The degree of equivalence of each laboratory i participant in EUROMET.M.MK2 with respect to the CCM.MK2 key comparison reference value is given by a pair of terms: D_{i} and U_{i}, its expanded uncertainty (at a 95% level of confidence), both expressed in mg. These are computed as explained in Appendix A of the EUROMET.M.MK2 Final Report. 
The degrees of equivalence between any of the laboratories participating in EUROMET.M.MK2 and those participating in CCM.MK2 are not computed. The pairwise degrees of equivalence inside EUROMET.M.MK2 are given in Table 6 to 10 of the EUROMET.M.MK2 Final Report. 
The linking process is explained in Appendix A of the EUROMET.M.MK2.1 Final Report.
The degree of equivalence of each laboratory i participant in EUROMET.M.MK2.1 with respect to the CCM.MK2 key comparison reference value is given by a pair of terms: D_{i} and U_{i}, its expanded uncertainty (at a 95% level of confidence), both expressed in mg. These are computed as explained in Appendix A of the EUROMET.M.MK2.1 Final Report. 
The degrees of equivalence between any of the laboratories participating in EUROMET.M.MK2.1 and those participating in CCM.MK2 are not computed. The pairwise degrees of equivalence inside EUROMET.M.MK2.1 are given in Table 7 to 11 of the EUROMET.M.MK2.1 Final Report. 
The linking process is explained in section 7.3 of the APMP.M.MK2 Final Report.
The degree of equivalence of each laboratory i participant in APMP.M.MK2 with respect to the CCM.MK2 key comparison reference value is given by a pair of terms: D_{i} and U_{i}, its expanded uncertainty (k = 2), both expressed in mg. These are computed as explained in section 7.3 of the APMP.M.MK2 Final Report. 
The degrees of equivalence between two laboratories participating in APMP.M.MK2 is given by a pair of terms both expressed in mg: D_{ij} = D_{i } D_{j}, and its expanded uncertainty (k = 2) U_{ij}. The pairwise degrees of equivalence between any of the laboratories participating in APMP.M.MK2 and those participating in CCM.MK2 are not computed. 
The linking process is explained in section 6.2 of the APMP.M.MK2.1 Final Report.
The degree of equivalence of each laboratory i participant in APMP.M.MK2.1 with respect to the CCM.MK2 key comparison reference value is given by a pair of terms: D_{i} and U_{i}, its expanded uncertainty (k = 2), both expressed in mg. These are computed as explained in section 6.2 of the APMP.M.MK2.1 Final Report. 
No pairwise degrees of equivalence involving APMP.M.MK2.1 participants have been computed. 
The link is made through the EUROMET.M.MK2 key comparison using BEV and EIM results in both comparisons (see Section 5 of the EURAMET.M.MK2.2 Final Report).
No pairwise degrees of equivalence involving EURAMET.M.MK2.2 participants have been computed. 
The link is made through the EUROMET.M.MK2 key comparison using EIM results in both comparisons (see Section 7 of the EURAMET.M.MK2.3 Final Report).
The pairwise degrees of equivalence inside EURAMET.M.MK2.3 are given in Table 5 of the EURAMET.M.MK2.3 Final Report. 
The link is made through the results of NPL having participated in both comparisons (see Section 4 of the EURAMET.M.MK2.6 Final Report).
No pairwise degrees of equivalence involving EURAMET.M.MK2.6 participants have been computed. 
CCM.MK2, APMP.M.MK6, EUROMET.M.MK2, EUROMET.M.MK2.1,
APMP.M.MK2, APMP.M.MK2.1, EURAMET.M.MK2.2,
and EURAMET.M.MK2.6
MEASURAND : Mass
NOMINAL VALUE : 2 g
The key comparison reference value, x_{R}, is evaluated as the median of the x_{i} values. Its standard uncertainty is denoted u_{R}, see Appendix 1 of the CCM.MK2 Final Report. x_{R} = 0.0007 mg and u_{R} = 0.0004 mg 
The degree of equivalence of each laboratory with respect to the reference value is given by a pair of terms: D_{i} = (x_{i}  x_{R}) and U_{i}, its expanded uncertainty (at a 95% level of confidence), both expressed in mg. Detailed information on the evaluation of U_{i} may be found in Section 5 of the CCM.MK2 Final Report. 
The degree of equivalence between two laboratories is given by a pair of terms: D_{ij} = D_{i}  D_{j} = (x_{i}  x_{j}) and U_{ij}, its expanded uncertainty (at a 95% level of confidence), both expressed in mg. Detailed information on the evaluation of U_{ij} may be found in Section 6 of the CCM.MK2 Final Report. 
The APMP.M.MK6 results were analyzed and linked to the CCM.MK2 results using Generalised LeastSquares (sometimes known as GaussMarkov) estimation (see Section 7 of the APMP.M.MK6 Final Report). 
 the degree of equivalence of each laboratory participant in APMP.M.MK6 with respect to the CCM.MK2 key comparison reference value, D_{i} and U_{i}, and 
 the degrees of equivalence between two laboratories both participant in APMP.M.MK6, D_{ij} and U_{ij}, U_{i} and U_{ij} being the expanded uncertainties (k = 2) of D_{i} and D_{ij} respectively. The pairwise degrees of equivalence inside APMP.M.MK6 are given on pages 15 and 16 of the APMP.M.MK6 Final Report. 
Artefacts of nominal value 1 kg are also measured in the framework of key comparison APMP.M.MK6. This is reported together with CCM.MK1 results.
The linking process is explained in Appendix A of the EUROMET.M.MK2 Final Report.
The degree of equivalence of each laboratory i participant in EUROMET.M.MK2 with respect to the CCM.MK2 key comparison reference value is given by a pair of terms: D_{i} and U_{i}, its expanded uncertainty (at a 95% level of confidence), both expressed in mg. These are computed as explained in Appendix A of the EUROMET.M.MK2 Final Report. 
The degrees of equivalence between any of the laboratories participating in EUROMET.M.MK2 and those participating in CCM.MK2 are not computed. The pairwise degrees of equivalence inside EUROMET.M.MK2 are given in Table 6 to 10 of the EUROMET.M.MK2 Final Report. 
The linking process is explained in Appendix A of the EUROMET.M.MK2.1 Final Report.
The degree of equivalence of each laboratory i participant in EUROMET.M.MK2.1 with respect to the CCM.MK2 key comparison reference value is given by a pair of terms: D_{i} and U_{i}, its expanded uncertainty (at a 95% level of confidence), both expressed in mg. These are computed as explained in Appendix A of the EUROMET.M.MK2.1 Final Report. 
The degrees of equivalence between any of the laboratories participating in EUROMET.M.MK2.1 and those participating in CCM.MK2 are not computed. The pairwise degrees of equivalence inside EUROMET.M.MK2.1 are given in Table 7 to 11 of the EUROMET.M.MK2.1 Final Report. 
The linking process is explained in section 7.3 of the APMP.M.MK2 Final Report.
The degree of equivalence of each laboratory i participant in APMP.M.MK2 with respect to the CCM.MK2 key comparison reference value is given by a pair of terms: D_{i} and U_{i}, its expanded uncertainty (k = 2), both expressed in mg. These are computed as explained in section 7.3 of the APMP.M.MK2 Final Report. 
The degrees of equivalence between two laboratories participating in APMP.M.MK2 is given by a pair of terms both expressed in mg: D_{ij} = D_{i } D_{j}, and its expanded uncertainty (k = 2) U_{ij}. The pairwise degrees of equivalence between any of the laboratories participating in APMP.M.MK2 and those participating in CCM.MK2 are not computed. 
The linking process is explained in section 6.2 of the APMP.M.MK2.1 Final Report.
The degree of equivalence of each laboratory i participant in APMP.M.MK2.1 with respect to the CCM.MK2 key comparison reference value is given by a pair of terms: D_{i} and U_{i}, its expanded uncertainty (k = 2), both expressed in mg. These are computed as explained in section 6.2 of the APMP.M.MK2.1 Final Report. 
No pairwise degrees of equivalence involving APMP.M.MK2.1 participants have been computed. 
The link is made through the EUROMET.M.MK2 key comparison using BEV and EIM results in both comparisons (see Section 5 of the EURAMET.M.MK2.2 Final Report).
No pairwise degrees of equivalence involving EURAMET.M.MK2.2 participants have been computed. 
The link is made through the results of NPL having participated in both comparisons (see Section 4 of the EURAMET.M.MK2.6 Final Report).
No pairwise degrees of equivalence involving EURAMET.M.MK2.6 participants have been computed. 
CCM.MK2, APMP.M.MK6, EUROMET.M.MK2, EUROMET.M.MK2.1,
APMP.M.MK2, APMP.M.MK2.1, EURAMET.M.MK2.2,
and EURAMET.M.MK2.6
MEASURAND : Mass
NOMINAL VALUE : 100 mg
The key comparison reference value, x_{R}, is evaluated as the median of the x_{i} values. Its standard uncertainty is denoted u_{R}, see Appendix 1 of the CCM.MK2 Final Report. x_{R} = 0.0004 mg and u_{R} = 0.0002 mg 
The degree of equivalence of each laboratory with respect to the reference value is given by a pair of terms: D_{i} = (x_{i}  x_{R}) and U_{i}, its expanded uncertainty (at a 95% level of confidence), both expressed in mg. Detailed information on the evaluation of U_{i} may be found in Section 5 of the CCM.MK2 Final Report. 
The degree of equivalence between two laboratories is given by a pair of terms: D_{ij} = D_{i}  D_{j} = (x_{i}  x_{j}) and U_{ij}, its expanded uncertainty (at a 95% level of confidence), both expressed in mg. Detailed information on the evaluation of U_{ij} may be found in Section 6 of the CCM.MK2 Final Report. 
The APMP.M.MK6 results were analyzed and linked to the CCM.MK2 results using Generalised LeastSquares (sometimes known as GaussMarkov) estimation (see Section 7 of the APMP.M.MK6 Final Report). 
 the degree of equivalence of each laboratory participant in APMP.M.MK6 with respect to the CCM.MK2 key comparison reference value, D_{i} and U_{i}, and 
 the degrees of equivalence between two laboratories both participant in APMP.M.MK6, D_{ij} and U_{ij}, U_{i} and U_{ij} being the expanded uncertainties (k = 2) of D_{i} and D_{ij} respectively. The pairwise degrees of equivalence inside APMP.M.MK6 are given on pages 15 and 16 of the APMP.M.MK6 Final Report. 
Artefacts of nominal value 1 kg are also measured in the framework of key comparison APMP.M.MK6. This is reported together with CCM.MK1 results.
The linking process is explained in Appendix A of the EUROMET.M.MK2 Final Report.
The degree of equivalence of each laboratory i participant in EUROMET.M.MK2 with respect to the CCM.MK2 key comparison reference value is given by a pair of terms: D_{i} and U_{i}, its expanded uncertainty (at a 95% level of confidence), both expressed in mg. These are computed as explained in Appendix A of the EUROMET.M.MK2 Final Report. 
The degrees of equivalence between any of the laboratories participating in EUROMET.M.MK2 and those participating in CCM.MK2 are not computed. The pairwise degrees of equivalence inside EUROMET.M.MK2 are given in Table 6 to 10 of the EUROMET.M.MK2 Final Report. 
The linking process is explained in Appendix A of the EUROMET.M.MK2.1 Final Report.
The degree of equivalence of each laboratory i participant in EUROMET.M.MK2.1 with respect to the CCM.MK2 key comparison reference value is given by a pair of terms: D_{i} and U_{i}, its expanded uncertainty (at a 95% level of confidence), both expressed in mg. These are computed as explained in Appendix A of the EUROMET.M.MK2.1 Final Report. 
The degrees of equivalence between any of the laboratories participating in EUROMET.M.MK2.1 and those participating in CCM.MK2 are not computed. The pairwise degrees of equivalence inside EUROMET.M.MK2.1 are given in Table 7 to 11 of the EUROMET.M.MK2.1 Final Report. 
The degrees of equivalence between two laboratories participating in APMP.M.MK2 is given by a pair of terms both expressed in mg: D_{ij} = D_{i } D_{j}, and its expanded uncertainty (k = 2) U_{ij}. The pairwise degrees of equivalence between any of the laboratories participating in APMP.M.MK2 and those participating in CCM.MK2 are not computed. 
The linking process is explained in section 7.3 of the APMP.M.MK2 Final Report.
The degree of equivalence of each laboratory i participant in APMP.M.MK2 with respect to the CCM.MK2 key comparison reference value is given by a pair of terms: D_{i} and U_{i}, its expanded uncertainty (k = 2), both expressed in mg. These are computed as explained in section 7.3 of the APMP.M.MK2 Final Report. 
The degrees of equivalence between two laboratories participating in APMP.M.MK2 is given by a pair of terms both expressed in mg: D_{ij} = D_{i } D_{j}, and its expanded uncertainty (k = 2) U_{ij}. The pairwise degrees of equivalence between any of the laboratories participating in APMP.M.MK2 and those participating in CCM.MK2 are not computed. 
The linking process is explained in section 6.2 of the APMP.M.MK2.1 Final Report.
The degree of equivalence of each laboratory i participant in APMP.M.MK2.1 with respect to the CCM.MK2 key comparison reference value is given by a pair of terms: D_{i} and U_{i}, its expanded uncertainty (k = 2), both expressed in mg. These are computed as explained in section 6.2 of the APMP.M.MK2.1 Final Report. 
No pairwise degrees of equivalence involving APMP.M.MK2.1 participants have been computed. 
The link is made through the EUROMET.M.MK2 key comparison using BEV and EIM results in both comparisons (see Section 5 of the EURAMET.M.MK2.2 Final Report)
No pairwise degrees of equivalence involving EURAMET.M.MK2.2 participants have been computed. 
The link is made through the results of NPL having participated in both comparisons (see Section 4 of the EURAMET.M.MK2.6 Final Report).
No pairwise degrees of equivalence involving EURAMET.M.MK2.6 participants have been computed. 
CCM.MK2, EUROMET.M.MK2, EUROMET.M.MK2.1, APMP.M.MK2, EURAMET.M.MK2.3, and EURAMET.M.MK2.5
MEASURAND : Mass
NOMINAL VALUE : 10 kg
x_{(rep)i} : reported result obtained as the difference between the measurement of the mass standard carried out by laboratory i and its nominal value
u_{i }: combined standard uncertainty of x_{(rep)i}
Three sets of mass standards, designated as CA, CB and CC, were circulated.
For each set of mass standards the Pilot Laboratory, PTB, carried out two measurements: the first one before the circulation and the second one after the circulation, as indicated respectively by (1) and (2).
x_{i} : difference between the mass determined by laboratory i, x_{(rep)i}, and that determined by the Pilot Laboratory.
The Pilot's mass value is the average of the two results obtained before and after the circulation.
Lab i  x_{(rep)i}  u_{i}  x_{i}_{ }  Date of measurement  
Set of mass standards CA  
PTB (1) 
2.135 
0.122  0.006  Mar 98  
NMIA 
2.200 
0.340  0.071  Jul 98  
KRISS 
2.296 
0.148  0.167  Aug 98  
NMIJ 
1.930 
0.280  0.199  Sep 98  
NIM 
1.700 
0.500  0.429  Nov 98  
PTB (2) 
2.123 
0.122  0.006  Mar 99  
Set of mass standards CB  
PTB (1) 
3.071 
0.122  0.019  Mar 98  
NPL 
3.200 
0.150  0.149  Aug 98  
CENAM 
1.680 
0.760  1.371  Sep 98  
NRC 
1.200 
0.970  1.851  Nov 98  
NIST 
2.952 
0.197  0.099 
Dec 98 

PTB (2) 
3.032 
0.122 
0.019 
Mar 99 

Set of mass standards CC  
PTB (1) 
8.542 
0.122 
0.023 
Mar 98 

VSL 
8.900 
1.100 
0.381 
Jun 98 

SMU 
6.870 
0.860 
1.649 
Aug 98 

METAS 
8.465 
0.251 
0.054 
Sep 98 

LNE 
8.800 
0.300 
0.281 
Oct 98 

INRIM 
8.760 
0.228 
0.241 
Nov 98 

PTB (2) 
8.496 
0.122 
0.023 
Mar 99 
Note: all values are expressed in mg
The results and uncertainties reported by the participants in EUROMET.M.MK2 are given in Table 2 of the EUROMET.M.MK2 Final Report.
The results and uncertainties reported by the participants in EUROMET.M.MK2.1 are given in Table 3 of the EUROMET.M.MK2.1 Final Report.
The results and uncertainties reported by the participants in APMP.M.MK2 are given in Table 1 of the APMP.M.MK2 Final Report.
The results and uncertainties reported by the participants in EURAMET.M.MK2.3 are given in Table 2 of the EURAMET.M.MK2.3 Final Report.
The results and uncertainties reported by the participants in EURAMET.M.MK2.5 are given in Table 7 of the EURAMET.M.MK2.5 Final Report.
CCM.MK2, APMP.M.MK6, EUROMET.M.MK2, EUROMET.M.MK2.1, APMP.M.MK2, APMP.M.MK2.1, EURAMET.M.MK2.2,
EURAMET.M.MK2.3, and EURAMET.M.MK2.6
MEASURAND : Mass
NOMINAL VALUE : 500 g
Note: all values are expressed in mg
x_{(rep)i} : reported result obtained as the difference between the measurement of the mass standard carried out by laboratory i and its nominal value
u_{i }: combined standard uncertainty of x_{(rep)i}
Three sets of mass standards, designated as CA, CB and CC, were circulated.
For each set of mass standards the Pilot Laboratory, PTB, carried out two measurements: the first one before the circulation and the second one after the circulation, as indicated respectively by (1) and (2).
x_{i} : difference between the mass determined by laboratory i, x_{(rep)i}, and that determined by the Pilot Laboratory.
The Pilot's mass value is the average of the two results obtained before and after the circulation.
Lab i  x_{(rep)i}  u_{i}  x_{i}_{ }  Date of measurement  
Set of mass standards CA  
PTB (1) 
0.1801 
0.0062  0.0028  Mar 98  
NMIA 
0.1820 
0.0200  0.0047  Jul 98  
KRISS 
0.1719 
0.0073  0.0054  Aug 98  
NMIJ 
0.1490 
0.0080  0.0283  Sep 98  
NIM 
0.1700 
0.0120  0.0073  Nov 98  
PTB (2) 
0.1745 
0.0062  0.0028  Mar 99  
Set of mass standards CB  
PTB (1) 
0.2149 
0.0062  0.0019  Mar 98  
NPL 
0.2090 
0.0074  0.0040  Aug 98  
CENAM 
0.1922 
0.0094  0.0208  Sep 98  
NRC 
0.2062 
0.0078  0.0068  Nov 98  
NIST 
0.2108 
0.0081  0.0022 
Dec 98 

PTB (2) 
0.2111 
0.0062 
0.0019 
Mar 99 

Set of mass standards CC  
PTB (1) 
0.5135 
0.0062 
0.0021 
Mar 98 

VSL 
0.5600 
0.0200 
0.0487 
Jun 98 

SMU 
0.5140 
0.0220 
0.0027 
Aug 98 

METAS 
0.5010 
0.0151 
0.0104 
Sep 98 

LNE 
0.5140 
0.0150 
0.0027 
Oct 98 

INRIM 
0.4990 
0.0076 
0.0124 
Nov 98 

PTB (2) 
0.5092 
0.0062 
0.0021 
Mar 99 
x_{APMP i} : reported result obtained as the difference between the measurement of the mass standards carried out by laboratory i and its nominal value
u_{APMP} _{i }: combined standard uncertainty of x_{APMP i}
As APMP.M.MK6 Pilot Laboratory, VMISTAMEQ determined the mass of the travelling standards four times for Loop A of the comparison, and three times for Loop B of the comparison.
Lab i  x_{APMP i}  u_{APMP i}  Date of measurement  
Loop A  
VMISTAMEQ 
0.213 
0.0207  May 2005  
NMISA 
0.17 
0.125  June 2005  
NMIA 
0.228 
0.024  September 2005  
VMISTAMEQ 
0.201 
0.0374  November 2005  
ITDI 
0.265 
0.043  December 2005  
NIMT 
0.237 
0.038  January 2006  
VMISTAMEQ 
0.209 
0.0374  April 2006  
NIS 
 
  July 2006  
VMISTAMEQ 
0.198 
0.0374  November 2006  
Loop B  
VMISTAMEQ 
0.148 
0.0207 
May 2005 

MUSSD 
0.1216 
0.133 
June 2005 

NPLI 
0.191 
0.041 
October 2005 

VMISTAMEQ 
0.139 
0.0374 
December 2005 

KIMLIPI* 
 
0.031 
March 2006 

VMISTAMEQ 
4.45 
0.0374 
October 2006 
* Measurement results invalidated due to damage of the transfer standards
The results and uncertainties reported by the participants in EUROMET.M.MK2 are given in Table 2 of the EUROMET.M.MK2 Final Report.
The results and uncertainties reported by the participants in EUROMET.M.MK2.1 are given in Table 3 of the EUROMET.M.MK2.1 Final Report.
The results and uncertainties reported by the participants in APMP.M.MK2 are given in Table 1 of the APMP.M.MK2 Final Report.
The results and uncertainties reported by the participants in APMP.M.MK2.1 are given in Table 1 of the APMP.M.MK2.1 Final Report.
The results and uncertainties reported by the participants in EURAMET.M.MK2.2 are given in Table 10 of the EURAMET.M.MK2.2 Final Report.
The results and uncertainties reported by the participants in EURAMET.M.MK2.3 are given in Table 2 of the EURAMET.M.MK2.3 Final Report.
The results and uncertainties reported by the participants in EURAMET.M.MK2.6 are given in Table 6 of the EURAMET.M.MK2.6 Final Report.
CCM.MK2, APMP.M.MK6, EUROMET.M.MK2, EUROMET.M.MK2.1, APMP.M.MK2, APMP.M.MK2.1, EURAMET.M.MK2.2,
EURAMET.M.MK2.3, and EURAMET.M.MK2.6
MEASURAND : Mass
NOMINAL VALUE : 20 g
Note: all values are expressed in mg
x_{(rep)i} : reported result obtained as the difference between the measurement of the mass standard carried out by laboratory i and its nominal value
u_{i }: combined standard uncertainty of x_{(rep)i}
Three sets of mass standards, designated as CA, CB and CC, were circulated.
For each set of mass standards the Pilot Laboratory, PTB, carried out two measurements: the first one before the circulation and the second one after the circulation, as indicated respectively by (1) and (2).
x_{i} : difference between the mass determined by laboratory i, x_{(rep)i}, and that determined by the Pilot Laboratory.
The Pilot's mass value is the average of the two results obtained before and after the circulation.
Lab i  x_{(rep)i}  u_{i}  x_{i}_{ }  Date of measurement  
Set of mass standards CA  
PTB (1) 
0.0052 
0.0023  0.0009  Mar 98  
NMIA 
0.0053 
0.0030  0.0011  Jul 98  
KRISS 
0.0029 
0.0009  0.0014  Aug 98  
NMIJ 
0.0040 
0.0020  0.0003  Sep 98  
NIM 
0.0015 
0.0020  0.0028  Nov 98  
PTB (2) 
0.0033 
0.0023  0.0010  Mar 99  
Set of mass standards CB  
PTB (1) 
0.0035 
0.0023  0.0007  Mar 98  
NPL 
0.0008 
0.0009  0.0034  Aug 98  
CENAM 
0.0016 
0.0021  0.0026  Sep 98  
NRC 
0.0015 
0.0037  0.0027  Nov 98  
NIST 
0.0011 
0.0010  0.0031 
Dec 98 

PTB (2) 
0.0049 
0.0023 
0.0007 
Mar 99 

Set of mass standards CC  
PTB (1) 
0.0024 
0.0023 
0.0000 
Mar 98 

VSL 
0.0020 
0.0040 
0.0044 
Jun 98 

SMU 
0.0119 
0.0035 
0.0095 
Aug 98 

METAS 
0.0064 
0.0026 
0.0088 
Sep 98 

LNE 
0.0037 
0.0026 
0.0061 
Oct 98 

INRIM 
0.0039 
0.0038 
0.0015 
Nov 98 

PTB (2) 
0.0024 
0.0023 
0.0000 
Mar 99 
x_{APMP i} : reported result obtained as the difference between the measurement of the mass standards carried out by laboratory i and its nominal value
u_{APMP} _{i }: combined standard uncertainty of x_{APMP i}
As APMP.M.MK6 Pilot Laboratory, VMISTAMEQ determined the mass of the travelling standards four times for Loop A of the comparison, and three times for Loop B of the comparison.
Lab i  x_{APMP i}  u_{APMP i}  Date of measurement  
Loop A  
VMISTAMEQ 
0.003 
0.0022  May 2005  
NMISA 
0.006 
0.0135  June 2005  
NMIA 
0.0026 
0.0032  September 2005  
VMISTAMEQ 
0.0057 
0.0029  November 2005  
ITDI 
0.013 
0.011  December 2005  
NIMT 
0.002 
0.004  January 2006  
VMISTAMEQ 
0.00074 
0.0030  April 2006  
NIS 
0.018 
0.009  July 2006  
VMISTAMEQ 
0.0064 
0.0030  November 2006  
Loop B  
VMISTAMEQ 
0.0005 
0.0022 
May 2005 

MUSSD 
0.0182 
0.013 
June 2005 

NPLI 
0.0099 
0.0035 
October 2005 

VMISTAMEQ 
0.004 
0.0041 
December 2005 

KIMLIPI 
0.009 
0.0037 
March 2006 

VMISTAMEQ 
0.011 
0.0036 
October 2006 
The results and uncertainties reported by the participants in EUROMET.M.MK2 are given in Table 2 of the EUROMET.M.MK2 Final Report.
The results and uncertainties reported by the participants in EUROMET.M.MK2.1 are given in Table 3 of the EUROMET.M.MK2.1 Final Report.
The results and uncertainties reported by the participants in APMP.M.MK2 are given in Table 1 of the APMP.M.MK2 Final Report.
The results and uncertainties reported by the participants in APMP.M.MK2.1 are given in Table 1 of the APMP.M.MK2.1 Final Report.
The results and uncertainties reported by the participants in EURAMET.M.MK2.2 are given in Table 10 of the EURAMET.M.MK2.2 Final Report.
The results and uncertainties reported by the participants in EURAMET.M.MK2.3 are given in Table 2 of the EURAMET.M.MK2.3 Final Report.
The results and uncertainties reported by the participants in EURAMET.M.MK2.6 are given in Table 6 of the EURAMET.M.MK2.6 Final Report.
CCM.MK2, APMP.M.MK6, EUROMET.M.MK2, EUROMET.M.MK2.1,
APMP.M.MK2, APMP.M.MK2.1, EURAMET.M.MK2.2,
and EURAMET.M.MK2.6
MEASURAND : Mass
NOMINAL VALUE : 2 g
Note: all values are expressed in mg
x_{(rep)i} : reported result obtained as the difference between the measurement of the mass standard carried out by laboratory i and its nominal value
u_{i }: combined standard uncertainty of x_{(rep)i}
Three sets of mass standards, designated as CA, CB and CC, were circulated.
For each set of mass standards the Pilot Laboratory, PTB, carried out two measurements: the first one before the circulation and the second one after the circulation, as indicated respectively by (1) and (2).
x_{i} : difference between the mass determined by laboratory i, x_{(rep)i}, and that determined by the Pilot Laboratory.
The Pilot's mass value is the average of the two results obtained before and after the circulation.
Lab i  x_{(rep)i}  u_{i}  x_{i}_{ }  Date of measurement  
Set of mass standards CA  
PTB (1) 
0.0002 
0.0007  0.0008  Mar 98  
NMIA 
0.0014 
0.0006  0.0004  Jul 98  
KRISS 
0.0004 
0.0004  0.0014  Aug 98  
NMIJ 
0.0004 
0.0005  0.0014  Sep 98  
NIM 
0.0008 
0.0006  0.0002  Nov 98  
PTB (2) 
0.0018 
0.0007  0.0008  Mar 99  
Set of mass standards CB  
PTB (1) 
0.0036 
0.0007  0.0003  Mar 98  
NPL 
0.0031 
0.0002  0.0008  Aug 98  
CENAM 
0.0032 
0.0006  0.0007  Sep 98  
NRC 
0.0004 
0.0015  0.0035  Nov 98  
NIST 
0.0025 
0.0004  0.0013 
Dec 98 

PTB (2) 
0.0041 
0.0007 
0.0003 
Mar 99 

Set of mass standards CC  
PTB (1) 
0.0032 
0.0007 
0.0005 
Mar 98 

VSL 
0.0010 
0.0030 
0.0018 
Jun 98 

SMU 
0.0034 
0.0020 
0.0007 
Aug 98 

METAS 
0.0045 
0.0010 
0.0018 
Sep 98 

LNE 
0.0043 
0.0010 
0.0016 
Oct 98 

INRIM 
0.0012 
0.0018 
0.0016 
Nov 98 

PTB (2) 
0.0023 
0.0007 
0.0005 
Mar 99 
x_{APMP i} : reported result obtained as the difference between the measurement of the mass standards carried out by laboratory i and its nominal value
u_{APMP} _{i }: combined standard uncertainty of x_{APMP i}
As APMP.M.MK6 Pilot Laboratory, VMISTAMEQ determined the mass of the travelling standards four times for Loop A of the comparison, and three times for Loop B of the comparison.
Lab i  x_{APMP i}  u_{APMP i}  Date of measurement  
Loop A  
VMISTAMEQ 
0.0125 
0.001  May 2005  
NMISA 
0.014 
0.0065  June 2005  
NMIA 
0.0128 
0.0011  September 2005  
VMISTAMEQ 
0.0115 
0.001  November 2005  
ITDI 
0.006 
0.01  December 2005  
NIMT 
0.0112 
0.0021  January 2006  
VMISTAMEQ 
0.011 
0.001  April 2006  
NIS 
0.008 
0.007  July 2006  
VMISTAMEQ 
0.0096 
0.001  November 2006  
Loop B  
VMISTAMEQ 
0.004 
0.001 
May 2005 

MUSSD 
0.0049 
0.007 
June 2005 

NPLI 
0.0017 
0.0006 
October 2005 

VMISTAMEQ 
0.005 
0.001 
December 2005 

KIMLIPI 
0.0023 
0.0015 
March 2006 

VMISTAMEQ 
0.004 
0.001 
October 2006 
The results and uncertainties reported by the participants in EUROMET.M.MK2 are given in Table 2 of the EUROMET.M.MK2 Final Report.
The results and uncertainties reported by the participants in EUROMET.M.MK2.1 are given in Table 3 of the EUROMET.M.MK2.1 Final Report.
The results and uncertainties reported by the participants in APMP.M.MK2 are given in Table 1 of the APMP.M.MK2 Final Report.
The results and uncertainties reported by the participants in APMP.M.MK2.1 are given in Table 1 of the APMP.M.MK2.1 Final Report.
The results and uncertainties reported by the participants in EURAMET.M.MK2.2 are given in Table 10 of the EURAMET.M.MK2.2 Final Report.
The results and uncertainties reported by the participants in EURAMET.M.MK2.6 are given in Table 6 of the EURAMET.M.MK2.6 Final Report.
CCM.MK2, APMP.M.MK6, EUROMET.M.MK2, EUROMET.M.MK2.1,
APMP.M.MK2, APMP.M.MK2.1, EURAMET.M.MK2.2,
and EURAMET.M.MK2.6
MEASURAND : Mass
NOMINAL VALUE : 100 mg
Note: all values are expressed in mg
x_{(rep)i} : reported result obtained as the difference between the measurement of the mass standard carried out by laboratory i and its nominal value
u_{i }: combined standard uncertainty of x_{(rep)i}
Three sets of mass standards, designated as CA, CB and CC, were circulated.
For each set of mass standards the Pilot Laboratory, PTB, carried out two measurements: the first one before the circulation and the second one after the circulation, as indicated respectively by (1) and (2).
x_{i} : difference between the mass determined by laboratory i, x_{(rep)i}, and that determined by the Pilot Laboratory.
The Pilot's mass value is the average of the two results obtained before and after the circulation.
Lab i  x_{(rep)i}  u_{i}  x_{i}_{ }  Date of measurement  
Set of mass standards CA  
PTB (1) 
0.0000 
0.0003  0.0002  Mar 98  
NMIA 
0.0005 
0.0003  0.0003  Jul 98  
KRISS 
0.0011 
0.0001  0.0009  Aug 98  
NMIJ 
0.0009 
0.0002  0.0007  Sep 98  
NIM 
0.0007 
0.0003  0.0005  Nov 98  
PTB (2) 
0.0004 
0.0003  0.0002  Mar 99  
Set of mass standards CB  
PTB (1) 
0.0002 
0.0003  0.0001  Mar 98  
NPL 
0.0005 
0.0004  0.0004  Aug 98  
CENAM 
0.0012 
0.0004  0.0011  Sep 98  
NRC 
0.0003 
0.0003  0.0002  Nov 98  
NIST 
0.0008 
0.0001  0.0006 
Dec 98 

PTB (2) 
0.0001 
0.0003 
0.0001 
Mar 99 

Set of mass standards CC  
PTB (1) 
0.0007 
0.0003 
0.0004 
Mar 98 

VSL 
0.0004 
0.0008 
0.0007 
Jun 98 

SMU 
0.0002 
0.0010 
0.0009 
Aug 98 

METAS 
0.0014 
0.0003 
0.0004 
Sep 98 

LNE 
0.0019 
0.0004 
0.0008 
Oct 98 

INRIM 
0.0019 
0.0008 
0.0009 
Nov 98 

PTB (2) 
0.0014 
0.0003 
0.0004 
Mar 99 
x_{APMP i} : reported result obtained as the difference between the measurement of the mass standards carried out by laboratory i and its nominal value
u_{APMP} _{i }: combined standard uncertainty of x_{APMP i}
As APMP.M.MK6 Pilot Laboratory, VMISTAMEQ determined the mass of the travelling standards four times for Loop A of the comparison, and three times for Loop B of the comparison.
Lab i  x_{APMP i}  u_{APMP i}  Date of measurement  
Loop A  
VMISTAMEQ 
0.006 
0.001  May 2005  
NMISA 
0.005 
0.0025  June 2005  
NMIA 
0.0046 
0.00047  September 2005  
VMISTAMEQ 
0.008 
0.001  November 2005  
ITDI 
0.000 
0.009  December 2005  
NIMT 
0.0021 
0.0008  January 2006  
VMISTAMEQ 
0.005 
0.001  April 2006  
NIS 
0.0054 
0.0028  July 2006  
VMISTAMEQ 
0.006 
0.001  November 2006  
Loop B  
VMISTAMEQ 
0.0025 
0.001 
May 2005 

MUSSD 
0.0026 
0.0027 
June 2005 

NPLI 
0.0034 
0.0005 
October 2005 

VMISTAMEQ 
0.0028 
0.001 
December 2005 

KIMLIPI 
0.0049 
0.00066 
March 2006 

VMISTAMEQ 
0.0034 
0.001 
October 2006 
The results and uncertainties reported by the participants in EUROMET.M.MK2 are given in Table 2 of the EUROMET.M.MK2 Final Report.
The results and uncertainties reported by the participants in EUROMET.M.MK2.1 are given in Table 3 of the EUROMET.M.MK2.1 Final Report.
The results and uncertainties reported by the participants in APMP.M.MK2 are given in Table 1 of the APMP.M.MK2 Final Report.
The results and uncertainties reported by the participants in APMP.M.MK2.1 are given in Table 1 of the APMP.M.MK2.1 Final Report.
The results and uncertainties reported by the participants in EURAMET.M.MK2.2 are given in Table 10 of the EURAMET.M.MK2.2 Final Report.
The results and uncertainties reported by the participants in EURAMET.M.MK2.6 are given in Table 6 of the EURAMET.M.MK2.6 Final Report.