Multifunction: it is a compact, lightweight and functional ac multi-meter, with LCD screen, can display voltage, current, active power and energy at the same time. It does not control or effect the load in any way. Measurement Range: DROK digital multimeter voltage test range is AC 80~260V, current test range is 0~20A, power test range is 0~4.5KW, energy test range is 0~9999kWh. Application: the ac voltage meter perfect to work with a generator or solar panel setup, also great to monitor accumulated energy usage on devices that cycle on and off(refrigerator, dehumidifier, washing machine, wall a/c unit) and the phantom load(cable modem, router, DVR). Protection: our volt amp energy tester is designed with power alarm threshold preset function, overload alarm function (over power alarm threshold, backlight and power will flash to alarm); with built-in CT. LCD Display: the AC voltmeter ammeter has large clear numbers on the backlit display, making reading the results a breeze; the blue backlight can be turned on/off by the front accessible recessed switch located on the right side bezel.