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As a result of the recalibration of the US prototype kilogram all calibrations performed at NIST after December 2010 could show a +0.
Given the unprecedented change in mass, NIST will calibrate K20 on a more regular basis to maintain tighter control on the traceability to the international prototype kilogram.
The first stage in the realization of the mass scale is to disseminate the unit from the International Prototype Kilogram to the national standard followed by a transfer to a set of working standards at the one kilogram level.

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