B12 Digital Tester Electric Induction Electric Screwdriver Probe With Indicator Light Test Pen Sensor Product: 1. Electrical on-off detection: The hand places the touch electrode through the human body circuit, the inner core of the plug and wire is intact and the LED green light is on, and if it does not light up, the wire core is disconnected and the contact is poor. 2. To judge the zero fire wire, distinguish and identify the zero fire wire, insert the electric pen bit into the jack, and the green light is the fire wire, Inserted into another jack and no light is on, it is a neutral wire 3. Smart motherboard chip, profeionally upgraded chip control program with higher security and longer life 4. High-brightne work makes the measurement easier, still clearly visible in the sun, and has a longer life than ordinary bulbs 5. It is more convenient to carry around for work, considerate design, and be attentive everywhere Product parameters: Model: B12 LED lamp beads: high-brightne double-color lamp beads Measuring range: voltage 24V~250V Battery model: 3*LR41 button battery (built-in battery for delivery) Bit material: chrome vanadium steel bit Size: 140.8*21.3mm Bit diameter: 3.5mm Packaging and List: B12 24-250V flat-blade screwdriver 3.5mm high-brightne double-color lamp bead LED insulation multi-function induction test pen *1