High Quality Portable Hydrogen Gas Flow Meter 1.measure control air oxygen H2 flow rate 3.10-60LPM 3-30LPM 2-20LPM 0.5-8LPM ... 10-60LPM High Quality Portable Hydrogen Gas Flow Meter ... user application in medical equipment, air samplers, gas analyzers, pollution monitors, chemical injectors, cabinet purging, etc. Models in stock: 0.5 ...