The D.I. Mendeleev All-Russian Institute for Metrology (VNIIM) news
VNIIM expands mass unit dissemination to sub-milligram range
VNIIM carried out work related with transition to vacuum weighing with the State Primary Standard of the mass unit (kilogram) and thus expanding the range of unit dissemination in the sub-milligram range (masses from 0.05 mg to 0.5 mg). It provides metrological support of microbalances having an error below 1 mg for 50 µg, 100 µg, 200 µg and 500 µg weights. It was calibrated against the initial weight of 1.0 mg traceable to the standard kilogram.
The work on improving the standard was carried out following requests from organizations engaged in precise measurements of mass for physical and chemical analyses of various substances. Now the regional bodies of Rosstandart and accredited laboratories will be able to operate the existing and to create new secondary and working standards in the sub-milligram range. More information is here (in Russian).