– the intergovernmental organization through which Member States act together
     on matters related to measurement science and measurement standards.
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Calibration and characterization certificates: United Kingdom
2019
No. 2 1 kg mass prototype, No. 18 United Kingdom

2015
No. 130 1 kg mass standard in platinum-iridium, "B" NPL, United Kingdom
No. 71 1 kg mass standard in platinum-iridium, "A" NPL, United Kingdom

2013
No. 71 1 kg mass standard "A" in platinum-iridium NPL, United Kingdom

2004
No. 20 Prototype de masse, no 82 United Kingdom

2003
No. 34 1 kg mass standard in platinum-iridium, No. "A" NPL, United Kingdom

2001
No. 89 Helium-neon laser at 633 nm, No. 132 NPL, United Kingdom
No. 2 1 kg mass standard in platinum-iridium, No. "A" NPL, United Kingdom

Study Notes
2008
No. 3 1 kg mass standard, No. 651 NPL, United Kingdom
No. 2 1 kg mass standard in platinum-iridium, "A" NPL, United Kingdom

2003
No. 1 1 kg mass standard in platinum-iridium, No. 651 NPL, United Kingdom

2001
No. 1 1 kg mass standard in platinum-iridium, No. 651 NPL, United Kingdom
Traceability to the SI through the BIPM
Subject area:
What is traceability?
BIPM policy on stating uncertainties
Provision of BIPM technical services per Member State
Chemistry
Electricity
Ionizing Radiation
Mass
Time
Related articles
BIPM calibration and measurement services
Comparisons piloted by the BIPM