1. Professional design: This oxygen regulator uses the advanced disc to adjust the air flow up to 15 liters/min, with very tolerances. 2. Adjustable flow rate: 12 preset flow settings from 0 to 15LPM can be adjusted. The easy-to-read meter displays the current LPM. The discharge pressure of the safety valve is 0.5Mpa. 3. Rugged and durable: It is made of high-quality material, durable, not easy to rust, and has a service life. 4. [High safety] The oxygen flow meter has accurate flow, easy to use, constant pressure, constant flow, and high safety. colour:Green Material:plastic Package Contents: 1 x oxygen pressure regulator 1 x tube Only the above package content, other products are not included. Note: Light 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.