The flow meter of this oxygen regulator is 0-10L/min. It is adjustable.You just need to connect it to an oxygen cylinder to adjust the flow of oxygen output, without worrying about the oxygen flow being wasted because of too fast oxygen flow.Oxygen flow meters are suitable Compatible With home, outdoor, plateau, and hospital use. They need to monitor the outflow rate of oxygen. Allow oxygen to enter the body at a proper flow rate and concentration to ensure that the body absorbs it to the best extent possible.The pressure gauge uses high-quality glass, thick and anti-drop design, clear scale and high sensitivity. The pressure Regulator is made of high-quality brass, with high toughness, wear resistance, and more secure sealing. The oxygen cylinder connection port is equipped with gas filter Internet, double protection is more secure.The oxygen pressure reducing regulator uses a piston-type pressure reducing structure with a small volume. The input air pressure is 15Mpa and the output air pressure is 0.2-0.3Mpa. The capacity of the humidification bottle is 200ml. The minimum and maximum scales are marked on the humidification bottle.Product Name: Oxygen Flow MeterThread: G 5/8inch (External thread)Structure: Double-levelWorking temperature:-10-38 (Celsius)Colour:blue + transparentMaterial:Zinc alloy+ABSPackage Contents:1 x Oxygen Pressure Regulator1 x Nasal oxygen tube1 x English manualOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.