An electronic watt-hour meter is a device that measures and records over time the electric power flowing through a circuit . Although there are several different types of watt-hour meters, each consists essentially of a small electric motor and a counter. Specifications: Brand: Chint Model: DST634 Rated voltage: 3X220V/380V Reference frequency: 50Hz Display mode: counter display Overall size: 272*172*73 (mn) Mounting size: 242*150 (mm) Specified operating temperature: -25℃~+55℃ Ultimate operating temperature: -40℃~+70℃ Power circuit: ac meter Package Includes: 1 x Chint Electronic Watt hour Meter DTS634