1. electrical parameter measurement function (voltage, current, active power). 2. The power button clear function. 3. Power-down data storage function (cumulative power down before saving). 4. PC PC display function (display voltage, current, active power). 5. The serial communication function (comes with TTL serial interface, via various terminals communicate with the adapter plate, read, and set the parameters). B. front display and key 1. Power: measurement range 0 ~ 22kW 0 ~ 10kW within the display format of 0.000 to 9.999; Within 10 ~ 22kW display format 10.00 ~ 22.00. 2. Power: measurement range 0 ~ 9999kWh 0 ~ 10kWh within the display format of 0.000 to 9.999; 10 ~ 100kWh within the display format of 10.00 to 99.99; 100 ~ 1000kWh within the display format of 100.0 to 999.9; 1000 ~ 9999kWh and above the display format from 1000 to 9999. 3. Voltage: Test Range 80 ~ 260VAC Display Format 110.0 ~ 220.0. 4. Current: measurement range 0 ~ 100A Display Format 00.00 to 99.99. A built-in button on the panel, used to make electricity clear function, as shown in Figure 2. Electricity clear : Press ZERO key five seconds, then release the button! Press again to clear the key, the data is cleared and exit charge cleared, cleared so far completed. Considerations: 1. This module is suitable for indoor, not outdoor use. 2. the applied load should not exceed the rated power. 3. The wiring can not be wrong. Working voltage: 80 ~ 260VAC Test voltage: 80 ~ 260VAC Rated power: 100A / 22000W Working Frequency: 45-65Hz Measurement accuracy: 1.0 Material: PC+Metal colour: As shown Package Contents: 1 x Digital Multi-function Meter 1 x Coil Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.