Product Description Small and practical, easy to use. This product will make your life easier and more convenient. Function: 1. Electrical quantity measurement function (voltage, current, active power, electrical energy, frequency, power factor) 2. Overload alarm function (over-range alarm, backlight and flashing alarm) 3. Current alarm threshold preset function (current alarm threshold can be set) 4. Energy can use the reset button 5. Turn off to save data 6. Large LCD screen 7. Backlight 8. Function keys Backlight Control Short press the button to turn the backlight on or off, the backlight has a memory function and the on or off state can be saved when the power is off. Reset Power Step 1: Press and hold the button for 5 seconds until the power flashes, then release the button. Step 2: Short press the button again, the energy value will be reset to zero and the flashing reset state will end. Step 3: If there is no key operation within 5 seconds, it means the energy value is not cleared and it leaves the reset state. Set Current Alarm Threshold Step 1 Press and hold the button until the LCD displays "SET CLr", then release the button to enter the setting mode. Step 2: The window displays the power supply's alarm value for current, and the last digit, which can be truncated by 1, will start to flash. If there is no operation for more than 3 seconds, the position will automatically change the number. The method is the same as above. Step 3: When the setting is complete, press and hold the button for 5 seconds to save and exit automatically. The threshold for active power is between 0.0 and 2.5 kW. Six parameters can be displayed simultaneously. Function: Operating Voltage: 80 ~ 260 VAC Test Voltage: 80 ~ 260 VAC Rated Power: 100 A / 22000 W Working Frequency: 45-65Hz Measurement Accuracy: Class 1.0 Display Format: 1. Power test range: 0~22000W Start power measured: 0.2W <10W display format: 1.00~9.99W <100W display format: 10.0 ~ 99.9W <1000W display format: 100~999W <10000W display format: 1.00~9.90kW ≥10000W display format: 10.0~22.0kW 2. Energy test range: 0~999kWh <1kWh display format: 0~999Wh <10kWh display format: 1.00~9.99kWh ≥10kWh display format: 10~999kWh 3. Voltage test range: 80~260V Display format: 80~260V 4. Current test range: 0~100A Measurement start current: 0.001A <10A display format: 0.000~9.000A ≥10A display format: 10.00~99.99A 5. Frequency test range: 45 ~65Hz Display format: 45~65Hz 6. Power factor test range: 0~1PF Display format: 0.00~1.00PF Caution: 1. This module is suitable for indoor use, do not use it outdoors. 2. The external load must not exceed the rated power. 3. The wiring must not be incorrect. Package Includes: 1 * Ammeter Size: 9 x 5 x 2.5 cm