... within 1 hour or 1 dayThis type of pressure regulator(oxygen regulator,gas regulator,flowmeter) has following features:1) Designed ... for Oxygen, acetylene,argon,CO2,C2H2 etc applications and provide accurate regulation ... ) Scale: single or double scale with PSI (lb/in), bar, kgf/cm210) For flowmeter,polycarbonate flow tube and outer cover ...