... Nominal Caliber:DN15,DN20,DN25 SFK01 prepaid cool water meter, AccuracyB degreeVoltage3.1V3.7VStatic Display of Power Loss15uANominal ... and developed by this factory. On the base of original water meter, it makes data collection through inductor, makes corresponding ... nominal caliberDN15DN20DN25 executive standardCJ/T133-2001IC card cold water meter Maximum permissible error The low area from minimum ...