... control flow rate 3.various flowmeter Portable glass flow meter for air, oxygen, hydrogen 1.high quality gas flowmeter2,measure ... samplers, gas analyzers, pollution monitors, chemical injectors, cabinet purging, etc. Models in stock: 0.5-8LPM,1-12LPM,2-20LPM ,3 ... -30LPM,10-60LPM,etc.Specifications for other models: ModelMeasure RangeScrew threadAccuracyUnit price(USD)ml/min(Liquid)NM3 ...