Flow meter OGM-R-25 with oval gear (similar to ППО-25) is usually used for volume measurement of non-aggressive petroleum products. Equipped with a mechanical counting device, this flow meter can be used in stationary technical installations, as well as in mobile refueling and pumping installations on land. The elliptical gear flow meter OGM-R-25 should be used within the temperature range specified for the instrument, which ensures sufficient accuracy, usually up to 0.5%, and it is a relatively accurate flow measurement instrument.