... ,is the current international advanced one gas meter. Mainly for gas, natural gas, liquefied petroleum gas and other gas volume measurement.1) Compact structure, ... is electro dusted, which insures nice appearance, moisture-proof, gas corrosion-resistant and high impact-resistant;3) Sealing is good ... factory, we would give you a warm reception. ... Rotary mechanical type gas flow meter (G1.6, G2.5, G4)