Feature: 1. Multifunction: This inductive voltage test pen can be used to judge neutral wire, detect wire on/off, has self-test function. 2. Slotted Screwdriver: The pen head is designed as a slotted screwdriver with a diameter of 3mm, making it convenient for contact, assembly and disassembly. 3. High Brightness: The pen shell is transparent, built-in strong LED light, intuitive for testing, making measurement easier. 4. High Safety: Adopts intelligent motherboard chip and professional upgraded chip control program, has higher safety and longer service life. 5. Pen Clip Design: This electric test pen is more convenient to carry with you during work, with thoughtful pen clip design. Specification: Item Type: Electric Test Pen Material: ABS, Chromium Vanadium Steel Neutral Wire Judgment: Yes Wire On/Off Detection: Yes Self-Test Function: Yes Slotted Screwdriver: Yes LED Light: Strong Green Light Screwdriver Diameter: Approx. 3mm/0.1in Battery Model: 3 x LR41 Button Battery (Built-in) Capacity: 40mAh (Single Battery Capacity). Package List: 5 x Electric Test Pen