High Quality Portable Hydrogen Gas Flow Meter 1.measure control air ... 2-20LPM 0.5-8LPM 10-60LPM High Quality Portable Hydrogen Gas Flow Meter Gas flow meter for air, oxygen, hydrogen, ... OEM and user application in medical equipment, air samplers, gas analyzers, pollution monitors, chemical injectors, cabinet purging, etc ... 2-Fluorin rubber 3-Butyl 10-60LPM High Quality Portable Hydrogen Gas Flow Meter