Feature: 1. Multi Function: This inductive voltage test pen can be used for neutral live wire judgment, line on off detection, has self check function. 2. Slot Bit: The pen head is slot screwdriver bit designed, with the diameter of 3mm, convenient to contact, assemble and disassemble. 3. High Brightness: The pen shell is transparent, built in high brightness LED lamp bead, intuitive for testing, makes the measurement easier. 4. High Safety: Adopt intelligent motherboard chip and professionally upgraded chip control program, have higher security and longer service life. 5. Pen Clip Design: This electrical test pen is more convenient to carry around when working, with thoughtful pen clip design. Specification: Item Type: Electrical Tester Pen Material: ABS, chrome vanadium steel Neutral Live Wire Judgment: Yes Line On Off Detection: Yes Self Check Function: Yes Slot Screwdriver: Yes LED Lamp Bead: Bright green lamp bead Bit Diameter: Approx. 3mm/0.1in Battery Model: 3 x LR41 button battery (built in) Capacity: 40mAh (single battery capacity). Package List: 5 x Electrical Tester Pen