This series of products with a programmable measurement, display, digital communication and electrical power pulse 20ma output etc of intelligent instruments, can perform multifunctional power measurement, electricity measurement, data display, collection and transmission, and can be widely applied substation automation, distribution automation, building intelligence, enterprise internal power measurement, management, and evaluation. Measurement accuracy for 0.5 level, realize LCD scene shows and remote RS - 485 digital interface communication, using MODBUS - RTU communication agreement.