... dayThis type of pressure regulator(oxygen regulator,gas regulator,flowmeter) has following features:1) Designed for Oxygen, acetylene,argon,CO2,C2H2 ... compensated to ensure accurate readings when linerestrictions are present6) 2" 2.5 3 high-pressure gauge for easy reading7) ... PSI (lb/in), bar, kgf/cm210) For flowmeter,polycarbonate flow tube and outer cover are impact resistant for maximumdurability ...