Descriptions Active power is calculated as: P = U I cos, cos represents the power factor, purely resistive loads (such as incandescent, heater, etc.) the power factor is generally close to 1, inductive and capacitive load load power factor 0-1; therefore purely resistive load test time, P is substantially equal to or close to U I; test inductive or capacitive loads (such as refrigerators, washing machines, televisions, computers, etc.) when, P Less than U I As for the specific number to keep the power factor related to power factor different for each appliance, please show table prevail. Functions 1. Electrical parameter measurement function (voltage, current, active power, power). 2. Overload alarm function (over power alarm threshold, the backlight and power flicker tips). 3. The power alarm threshold preset function (can set up their own power alarm threshold). 4.The power button clear function. 5. Power-down data storage function. 6. Large-screen LCD screen full display function (display voltage, current, active power, power). 7. Backlight. Specifications Size: 90x50x25mm Apply to power grid voltage range 110V-220V Working voltage: 80 ~ 260V AC Test voltage: 80 ~ 260V AC Rated power: 100A / 22000W Working Frequency: 45-65Hz Measurement accuracy 1.0 Features:network voltage direct power supply, no external power supply, measurement precision, large-screen LCD liquid crystal screen display clearly. Packings includes: 1 x AC 80~260VAC 0~100A Digital LCD Voltmeter Ammeter Note: Please allow minor deviation due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.