... flow:less than 1.5m/s4.Compensation with temperture and pressure compensation(option).5.Lubricate with lubicated system(option)6.LCD display7 ... .Multi output pulse,4^20mADC.8.spectrum15,25,40,50,80,100,150,200,250 ... CentigradeHumidity:Less than 95%. LWGQ-300 Field display gas meter with Lithium battery