... gas flowmeter 2,measure and control flow rate 3.various flowmeter Portable glass flow meter for air, oxygen, hydrogen 1.high quality ... ideal for a wide range of OEM and user application in medical equipment, air samplers, gas analyzers, pollution monitors, chemical ... injectors, cabinet purging, etc. Models in stock: 0.5-8LPM,1-12LPM,2-20LPM ,3-30LPM ...