... DDSI726 Single-phase Electronic Carrier Watt-hour-meter 2)Output:3000pcs/day 3)CE,CB,ISO9001,14001,IEC 4)OEM GeneralDDSI726 single-phase carrier electronic watt-hour meter is ... and 2) and DL/T645-2007 Multi-function watt-hour meter communication Protocol. Function and features2.1 Can realize metering ... 50 or 60Accuracy classClass 1 or class 2 DDSI726 Single-phase Electronic Carrier Watt-hour-meter