1. AC voltage display and buzzer alarmThe electric test pen features an AC voltage display and buzzer alarm. When measuring AC voltage, the pen tip touches the live wire, and the hand touches the touch electrode on the side. This ensures accurate voltage measurement, taking into account individual variations in the human body's simulation of the earth. 2. Live Wire Identification, fast and sensitive discriminationThe test pen quickly and sensitively identifies live wire. By touching the touch pole with your hand and inserting the pen tip metal into the hole, the red screen and beeping sound confirm it as the live wire. In contrast, the green screen displays the voltage as 0V, indicating it as the neutral wire. 3. Intelligent noncontact, NCV power inductionWith noncontact induction, the test pen detects nearby AC voltage. The screen index rises from LOW to HiS, and the beeping alarm sound becomes more as the power source gets closer. This intelligent feature enhances safety and facilitates detection. 4. Line breakpoint detection, test pen functionThe test pen can also detect line breakpoints along the line. It indicates a smooth and good line by displaying a HiS index and producing a beep. In case of a disconnection, the index becomes LOW, providing effective troubleshooting.