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 PenMaterial: ABS, chrome vanadium steelNeutral Live Wire Judgment: YesLine On Off Detection: YesSelf Check Function: YesSlot Screwdriver: YesLED Lamp Bead: Bright green lamp beadBit Diameter: Approx. 3mm/0.1inBattery Model: 3 x LR41 button battery (built in)Capacity: 40mAh (single battery capacity).Package List:5 xElectrical Tester Pen