The multi-function power meter is a multi-functional smart meter with programmable measurement, display, digital communication and power pulse transmission output. It has the functions of power measurement, power measurement, data display, acquisition and transmission. Application of substation automation, power distribution automation, intelligent building, power measurement, management and assessment within enterprises. The measurement accuracy is 0.5, and it realizes LED on-site display and remote RS-485 digital interface communication, using MODBUS-RTU communication protocol.