When carrying out the proving, the following measuring instruments are used:

1) pressure conversion channel:

- digital pressure gauge (pressure setter) of any type, measuring range up to 10 MPa, relative error not more than ± 0,05%;

2) temperature measuring channel:

- resistance store MCP-63, class. 0.05;

- thermostat “Thermotest-100”, temperature regulation range -30 ... + 100 ° С, variability of maintenance of set temperature ± 0,01 ° С, inhomogeneity of the temperature field in the working volume of the thermostat ± 0,01 ° С;

- the reference thermometer of resistance ETS-100, the third category (the range of measured temperatures is -50 ... + 419 ° С, the error is not more than ± 0,015 ° С;

- converter of signals "TERCON", bases measurement error of resistance ± [0,0002 + 1 × 10^-5 × R], Ohm, voltage ± [0,0005 + 5 × 10^-5 × U_meter] mV.

3) Flow measuring channel:

- pulse generator type G6-28, the basic error is not more than ± 1%;

- frequency meter Ч3-64 / 1, basic error is not more than ± 1.5. 10^-7%;

4) general:

- an aneroid barometer M 67, measuring range from 81130 to 105320 Pa, error of not more than ± 106 Pa;

- hygrometer of psychrometric type VIT-1, range of measurement of relative humidity from 20 to 90%, measuring range of temperature from 15 to 40 °C, the division value of thermometer scales 0.1 °С.