Designed to control and adjust the oxygen flow Polycarbonate inner and outer tubes are highly shock-resistant The special design of Flowmeter body can avoid occurrence of leakage Stainless Steel Floating ball; anti-oxidation; keep the flow rate stable Stainless Steel needle valve maintains accurate measurement and long life performance Inner tube is marketed precisely. 0.5 to 5LPM is marked in enlarged scale; 5 to 15LPM is marked in general scale for easy observation. Can be used with BS and DIN probes