This product can directly and accurately measure the voltage, current, power, frequency, power factor, positive and negative active energy in single-phase AC power grids. The LCD displays real-time electricity consumption information, and real-time measurement data and operating parameters can also be read through Modbus or Mbus. It has the characteristics of good reliability, small size, light weight, beautiful appearance, and flexible and convenient installation. This product complies with the technical requirements of the national standard GB/T17215.321-2008 "Static Active Energy Meters (Level 1 and Level 2)".