Features 1、Support for electrical parameter measurement to measure voltage, current, active power and energy. 2、Support overload alarm function, exceeding power alarm threshold power flashing alarm. 3、Support power alarm threshold preset function, you can set the power alarm threshold by yourself. 4、Supports the energy button clear function and the power-down data save function to save the accumulated power before power-off. 5、The bright red digital tube display function displays voltage, current, active power and energy. 6、Support for peak port communication function, with TTL serial interface, can communicate with various terminals through the adapter board, read and set parameters. Specification Condition: 100% Brand New Item Type: Multifunctional Tester Model: PZEM-004 Power Test Range: 0~22kW 0~10kW, the display format is 0.000~9.999 10~22kW, the display format is 10.00~22.00 Energy Test Range: 0~9999kWh 0~10kWh, the display format is 0.000~9.999 10~100kWh, the display format is 10.00~99.99 100~1000kWh, the display format is 100.0~999.9 1000~9999kWh and above, the display format is 1000~9999 Current Test Range: 0~100A, Display Format is 00.00~99.99 Rated Power: 100A/22000W Working Frequency: 45-65Hz Measurement Accuracy: 1.0 Product Size: Approx. 12 x 6 x 2.8 cm / 4.7 x 2.4 x 1.1 in Weight: Approx. 198g / 7oz Package List 1 x Tester 1 x Split-core Transformer 1 x USB Adapter 1 x Chinese English User Manual