DIGITAL VOLTAGE TESTER WITH LCD DISPLAY: Contact measurement from 12 to 300V AC. During contact measurement, long press the 'VOLTAGE' key and the voltage value will display on the screen. This function is only available for contact measurement, not for non-contact measurement.VOLTAGE DETECTOR: In induction mode, the frequency of the beep increases with the intensity of the voltage. When high voltage is detected, the display will show 'HI', otherwise the display will show '--U'. When no voltage is detected, the display will show '---'. We can use it for phase detection and continuity testing. CONTINUITY TEST & BATTERY POLARITY TEST: Double indication by screen and beep. AUTOMATIC SWITCH OFF & FLASHLIGHT: Automatic shutdown after 5 minutes of inactivity to save energy.