Function 1 Electrical parameter measurement function voltage current active power energy 2 Voltage alarm function over voltage alarm threshold backlight and voltage flashing to alarm 3 The reset function of energy key 4 Store data when power off 5 Large screen LCD display voltage current active power energy at the same time 6 Backlight function Display format 1 Power test range 0 2kWWithin 1KW the display format is 0 0 999 9W 1KW and above the display format is 1000 2000W 2 Energy test range 0 9999kWhWithin 10KWh the display format is 0 9999Wh 10kWh and above the display format is 10 9999kWh 3 Voltage test range 6 5 100VDisplay format 6 50 99 99V4 Current test range 0 20ADisplay format 0 00 20 00 Key1 Backlight controlShort press the key to turn on or off the backlight the backlight has memory function it can store the on or off state when power off 2 Reset energyStep1 Long press the key until the power display area display CLr then release the key Step2 At this moment the energy is flashing to prompt this is the energy reset state if short press the key again then the energy value is cleared and exit the reset flashing state Step 3 If there is no operation within 5 seconds it means the energy value is not cleared and will exit the reset state 3 Set voltage alarm thresholdStep1 Long press the key until the power display area display SET then release the key Step2 After enter this state the voltage area display the current high