When carrying out the proving, the following measuring instruments are used:
- test bench for gas meters, flowrate range from 0.01 to 2500 m3/h, error ±0,25%; ±0,33%;
- hygrometer of psychrometric type VIT-1, VIT-2, range of measurement of relative humidity from 20 to 90%, temperature measurement range from 15 to 40 °C, temperature error ± 2 °C, humidity ± 5%, TU 25-11.1645 -84;
- бbarometer-aneroid M 67, measurement range from 81130 to 105320 Pa, error of ± 106 Pa, TU 2504-1797-75;
- Stopwatch SOS pr-2b-2, measurement range from 0 to 3600 s, accuracy class 2, TU 25-1894.003-90;
- digital pressure gauge DPI-145, measurement range from 0 to 3.5 MPa, error 0.025%;
- thermotest-100 thermostat, temperature control range from -30 to +100 °С, instability of maintaining the set temperature ± 0,01 °С, inhomogeneity of the temperature field in the working volume of the thermostat ± 0,01 °С.