Working voltage: 80 ~ 260VAC Test voltage: 80 ~ 260VAC Rated power: 100A/22000W Operating frequency: 45-65Hz Measurement accuracy: grade 1.0; Function: Electrical parameter measurement function (voltage, current, active power, energy). Overload alarm function (overpower alarm threshold, backlight and power flashing at alarm). Operating systems; XP, Vista and 7 (with drivers included) Power alarm threshold preset function (can set the power alarm threshold). The energy key reset function. Store data when power off. Large LCD display (display voltage, current, active power, energy at the same time) Backlight function. Display format: Power: test range: 0~22kW Within 1kW, the display format is 0.0~999.9W; Within 1kW ~10kW, the display format is 1000~9999W; 10kW and above, the display format is 0.1~22.0kW. Energy: range of Test: 0~9999kWh Within 10KWh, the display format is 0~9999Wh; 10 kWh and above, the display format is 10~9999 kWh. Voltage: Test range: 80~260V Display format: 80~260V