... output and display methods canbe selected.it can be used in the fields of air,natural gas and gas to be ... .spectrum15,25,40,50,80,100,150,200,250,300mm.Specification: DN(mm)Normal Flow Range(Nm3/h)PN(mPa)Pressure ... temperature: -20~50 Degree CentigradeHumidity:Less than 95%. LWGQ-300 Field display gas meter with Lithium battery