CNBTR LZQ-3 0-10 LPM Tube Type Acylic Flowmeter Gas 8mm Hose Fitting Oxygen Flowmeter Regulator Flow Meter Working pressure: 0.6Mpa; Center distance: 66.5mm Flow range: 0-10LPM accurate flow rate indicator Size of tubular fittings: 8mm/0.31in hose, fits standard home oxygen tubing. Turn the black knob to control the oxygen or gas flow from 0-10LPM. Product function: to measure oxygen and other gas single-phase non-pulsating flow