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Calibration and characterization certificates: United States of America
 
Traceability to the SI through the BIPM
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BIPM policy on stating uncertainties
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BIPM services in the field of electricity
BIPM services in the field of ionizing radiation
BIPM calibrations and services in mass and related quantities
BIPM services in the field of time, frequency and gravimetry
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For other services offered by the BIPM, please refer to the summary charts for electricity, ionizing radiation, mass and time, frequency and gravimetry.

2012
No. 4 1 kg mass prototype, No. 79 United States of America

 2011
No. 95 1 kg mass prototype, No. 4 United States of America
No. 4 1 kg mass prototype, No. 92 United States of America
No. 3 1 kg mass prototype, No. 20 United States of America

 2008
No. 57 Prototype de masse, n° 92 United States of America

 2003
No. 70 Prototype de masse, no 85 United States of America

 2001
No. 46 Helium-neon laser at 633 nm, No. 102 NIST, United States of America

 2000
No. 22 Prototype de masse, no 20 United States of America
No. 21 Prototype de masse, no 4 United States of America

Study Notes
2005
No. 1 Helium-neon laser at 633 nm, BIW167 Winters Electro-Optics, United States of America
 
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