2015GOST 8.457-2015 State system for ensuring the traceability of measurements. State verification schedule for means of measuring conductivity of liquids
2000GOST 8.457-2000 State system for ensuring the uniformity of measurements. State verification schedule for means of measuring specific conductivity of liguids
1982GOST 8.457-1982 State system for ensuring the uniformity of measurements. State primary standards and state verification schedule for means of measuring specific conductivity of solutions of electrolytes within the range of 1kh10 in minus 4 degree to 1kh10 in 2 degree S