The K series digital display electric meter is suitable for power grids and automation control systems. It can be used in conjunction with transformers, voltage dividers, diverters, and power transmitters to measure voltage, current power, power factor, frequency, and other electrical parameters in the power grid. The current to current ratio CT and voltage ratio PT can be freely set through the thin film button on the panel, and one alarm output can be selected to achieve upper and lower limit monitoring of the measured parameters. One channel analog output, three-phase current and voltage can be selected with three channels analog output RS-485 digital interface, using standard MODBUS-RTU protocol. This series of products has advantages such as high precision, strong isolation, stable performance, and vibration resistance, and can directly replace the original pointer type instruments. The products comply with GB/T13978-1992.