- AC voltage display and buzzer alarm: The electric test pen shows AC voltage on a screen and emits a buzzer when measuring. To measure, touch the live conductor with the pen tip and place the other hand on the side touch electrode. This arrangement provides reliable voltage readings by accounting for variations in the human body's impedance to earth. - Live wire identification, fast and highly sensitive: Quickly distinguishes live wires. Touch the pole with your hand and insert the pen tip into the hole; a red screen and beep confirm live, while a green screen shows 0V (neutral). - Intelligent non-contact NCV power induction: Non-contact detection of nearby AC voltage. The screen index rises from LOW to HiS and the beep increases as the power source gets closer, improving safety and ease of use. - Line breakpoint detection, test pen function: Detects line breakpoints along a circuit. A HiS index and a beep indicate a good line; if a disconnection occurs, the index drops to LOW, aiding troubleshooting. Use scenarios - Residential electrical work: verify wiring and power status in outlets, switches, and panels before servicing. - DIY and home maintenance: check cords, power strips, and appliances to confirm live status prior to handling or repair. - Industrial and workshop wiring: locate faults in control cables and wiring harnesses and identify live feeders in machinery and panels. Compact, handheld pen-style tester with clear visual and audible indicators for reliable performance in daily electrical checks.