Open and Close CT 100A AC Digital Display Power Monitor Meter Voltmeter Ammeter Frequency

Features:  1. Electrical parameter measurement function (voltage, current, active power, energy, frequency, power factor).  2. Overload alarm function (over power alarm threshold, backlight and power flashing to alarm).  3. Power alarm threshold preset function (can set power alarm threshold).  4. The energy can be reset use the key.  5. Store data when power off.  6. Large-screen LCD .  7. Backlight function.  8. Key Function.  ♦Backlight control:  Short 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.  ♦Reset energy:  Step1: Long press the key for 5 seconds until the energy value flash, then release the key.  Step2: Short press the key again, then the energy value is cleared and exit the reset flashing state.  Step3: If there is no operation on the key within 5 seconds, it means the energy value is not cleared and will exit the reset state.  ♦Set power alarm threshold:  Step1: Long press the key until