Description: A. Function: 1. Electrical parameter measurement (voltage, current, active power, energy, frequency, power factor). 2. Overload alarm function (over power alarm threshold, backlight and power flash to alarm). 3. Power alarm threshold preset function (can set power alarm threshold). 4. Energy can be reset using the key. 5. Store data when power is off. 6. Large LCD screen. 7. Backlight function. B. Appearance and Key Function: I. Display Interface The display interface is a large LCD screen, it can display six parameters simultaneously. II. Key 1. Backlight Control Short press the button to turn the backlight on or off. The backlight has a memory function and can store the on or off state when the power is off. 2. Reset Energy Step 1: Long press the button for 5 seconds until the energy value flashes, then release the button. Step 2: Short press the button again, then the energy value is cleared and the reset flashing mode is exited. Step 3: If there is no operation on the button within 5 seconds, it means that the energy value is not cleared and the reset mode is exited. 3. Set Power Alarm Threshold Step 1: Long press the button until the LCD screen displays \"SET CLr\", then release the button to enter the setting mode. Step 2: The power window displays the current power alarm value and the last digit starts to flash, then you can short press to increase by 1. When there is no operation for over 3 seconds, it will automatically switch to the next digit. The setting method is the same as above. Step 3: After completing the setting, long press the button for over 5 seconds to automatically save and exit. The active power threshold range is 0.0～2.5kW. C. Precautions: 1. This module is suitable for indoor use, please do not use it outdoors. 2. The applied load must not exceed the rated power. 3. The wiring sequence must not be wrong. D. Specification Parameters: 1. Working voltage: 80 ~ 260VAC 2. Test voltage: 80 ~ 260VAC 3. Rated power: 100A/22000W 4. Operating frequency: 45-65Hz 5. Measurement accuracy: 1.0 class