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Calibration and characterization certificates: United Kingdom of Great Britain and Northern Ireland
 
Traceability to the SI through the BIPM
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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.

2004
No. 20 Prototype de masse, no 82 NPL, United Kingdom of Great Britain and Northern Ireland

 2003
No. 34 1 kg mass standard in platinum-iridium, No. "A" NPL, United Kingdom of Great Britain and Northern Ireland

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

Study Notes
2008
No. 3 1 kg mass standard, No. 651 NPL, United Kingdom of Great Britain and Northern Ireland
No. 2 1 kg mass standard in platinum-iridium, "A" NPL, United Kingdom of Great Britain and Northern Ireland

 2003
No. 1 1 kg mass standard in platinum-iridium, No. 651 NPL, United Kingdom of Great Britain and Northern Ireland

 2001
No. 1 1 kg mass standard in platinum-iridium, No. 651 NPL, United Kingdom of Great Britain and Northern Ireland
 
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