... DN<40) 2>Output:pulse,4-20mADC 3>Display:LCD,LED 4>min.velocity of flow:less ... a high accuracy flow sensor.Several output and display methods canbe selected.it can be used in ... output pulse,4^20mADC.8.spectrum15,25,40,50,80,100,150,200,250,300mm.Specification: DN ... Centigrade.Ambient temperature: -20~50 Degree CentigradeHumidity:Less than 95%. LWGQ-300 Field display gas meter with Lithium battery