... instanl quick delivery tern micro flow meter,gas flow,liquid flow meter SBL digital target flow meter is improved from traditional flow meters ... volumetric, vane-wheel, by-pass, orifice, differential pressure, mechanical flow meter. It was widely used in fields of gas, natural gas ... type (ExiallBT4)Protection classIP65; IP67;IP68 The warranty is one year form the delivery date.if the trouble is causing ...