Energy Meters are meters used to measure electrical energy, also known as watt-hour meters, fire meters, and kilowatt-hour meters. Refers to instruments that measure various amounts of electricity. In order to meet the needs of different occasions and markets, various electric energy meters have emerged.

　　According to the purpose, it can be divided into active energy meters, reactive energy meters, maximum demand energy meters, multi-rate time-sharing Energy Meters, prepaid Energy Meters (magnetic card type, IC card type, password type), multi-function power meters,s and smart meters.

　　According to the working principle, it can be divided into induction type (mechanical type), static type (electronic type), and electromechanical type (hybrid type).

　　According to the nature of the power supply, it can be divided into DC type and AC type. According to the structure, it can be divided into integral type and split type.

　　According to the phase line, it can be divided into single-phase, three-phase three-wire, and three-phase four-wire Energy Meters.

　　According to the wiring method, it can be divided into direct access type and indirect access type.

　　Each Energy Meter should have its own model and nameplate when it leaves the factory, explaining its functions, main technical indicators,  and conditions of use, so as to facilitate users' use.