... flowmeter Portable glass flow meter for air, oxygen, hydrogen 1.high quality gas flowmeter2,measure and control flow rate3.various flowmeter Gas flow meter for air, oxygen, hydrogen, ... etc. Models in stock: 0.5-8LPM,1-12LPM,2-20LPM ,3-30LPM,10-60LPM,etc.Specifications for other models: ModelMeasure RangeScrew ... 4% 19NT-4T40-4001-12 l/mindirectN -6T25-2500.04-0.4tubeNT-6T16-1601-5 l/minG1/4"1/4"BSPNT ...