... meter, kwh meter)Application:Single phase and three phase watt-hour meter is applicable to measure the rated frequency50Hz and power loss in electrified wire ... : 100V ,220V, 230V, 240V, 380V2. Reference frequency: 50Hz or 60Hz3. Wire code: 2 wire, 3 wire, 4 wire4. Precision class: class 1.0, class ...