... type of pressure regulator(oxygen regulator,gas regulator,flowmeter) has following features:1) Designed for Oxygen, acetylene,argon,CO2,C2H2 ... Calibrated for argon, helium and carbon dioxide gases5) Flowmeter is backpressure compensated to ensure accurate readings when linerestrictions ... with PSI (lb/in), bar, kgf/cm210) For flowmeter,polycarbonate flow tube and outer cover are impact resistant ...