... ) 1-12, 2-20, 3-30,10-60L/min 2. oxygen gas flow 0.5-8LPM portable air flow meter Gas flow meter and ... , air 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. 0.5-8LPM portable air/oxygen flow meter