The Electronic gas volume converter PTZ-BOX 3.0 (hereinafter called: “the device”) is a measuring instrument designed for the conversion of the gas volume measure at measurement conditions to volume at base conditions. The information on the gas volume passing through is measured using the impulse outputs of the gas meter. The gas temperature and pressure are measured by integrated converters. The device calculates the ratio of compressibility factors of gas using standard methods or a constant value is used.