An international intercomparison of mass standards by the Consultative Committee for Mass and Related Quantities (CCM) was carried out between the national institutes of fourteen countries. The intercomparison has been performed by the round robin method, in which five weights with nominal values of 100mg, 2g, 20g, 500g, and 10kg are used as travelling standards. The National Research Laboratory of Metrology had reported their calibration results with the combined uncertainty (uc) of 0.0002～0.28mg.
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