The digital multi-function power meter is specially designed and manufactured for the power monitoring needs of the power distribution system, which can measure all commonly used power parameters with high accuracy, such as three-phase voltage, three-phase current, frequency, power factor, active power, reactive power, active energy, reactive energy etc; Adopted red LED display, RS485 communication interface, adopted MODBUS_ RTU communication protocol, the instrument panel is equipped with four programming buttons, which can facilitate the display switching on the site, and the instrument number is programmed, with strong flexibility.