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In 2013, the National Prototype of the Kilogram (NPK) No. 2 belonging to Romania,together with stainless steel kilogram standard Ni 81, received an updated mass value fromBIPM. Therefore, the first task after their receiving from BIPM was to perform comparisonsbetween NPK and reference kilograms stainless steel standards. In the paper are describedmass standards, weighing scheme used for comparisons, calculations of mass and associateduncertainties, as the mass change for all weights involved. It is also presented acomparison between Romanian CMC(s) and other countries for this important stage ofdissemination of mass unit

Comparison between the National Prototype of the kilogram and stainless steel mass standards