Voltage Testor 90~1000V AC Electric Detector It Helps to distinguish the earth wire and live wire of 90-1000V AC power supplier and alerts you of the high intense radiation from powered home appliances. It is a Non-contact CAT III voltage tester gives you a warning red light and Beep sound when the high voltage or intense electric radiation is detected. Just touch the tip to a terminal strip, outlet, or supply cord. When the tip glows red and the unit beeps, you know there is voltage present. Electricians, maintenance, service, safety personnel, and homeowners can quickly test for energized circuits in the workplace or at home. Frequency range: 50 to 500 Hz test voltage range: 90-1000v ac safety rating