... Nominal Caliber:DN15,DN20,DN25 SFK01 prepaid cool water meter, AccuracyB degreeVoltage3.1V3.7VStatic Display of Power Loss15uANominal ... CaliberDN15DN20DN25Using Humidity≤93% SFK01 prepaid cool water meter is a new product researched and developed by this ... factory. On the base of original water meter, it makes data collection through inductor, makes corresponding ...