Non-Contact Safety Voltage Testercan be tested without physical contact. The buzzer and flashing light remind at the same time and increase the safety factor. Insulation operation ensures safety testing. Automatically differentiates between zero line and live line, also suitable for detecting line break in 110V and 220V power system. 9 levels of sensitivity to choose from. The voltage range is 12-1000 VAC. During use, the probe's NVC sensor automatically detects the voltage intensity. The meter activates the corresponding signal strength indicator based on p. Low voltage display If the battery voltage is lower than about 2.6V, the display of operation flashes three times and the buzzer sounds and turns off automatically. Please replace the battery. LCD display and LED flashlightH/L display intensity, red is the highest intensity. The white LED flashlight has high brightness and low power consumption, which illuminates the work area in the dark. Lighting and probe are combined for easy measurement. Auto Shut-off and Handheld Stylus Hook After about 3 minutes without operation or signal detection, the voltage detector will automatically shut down to extend battery life and save energy. With the convenient portable pencil hook, you can easily remove and carry it.