Electrical on-off detectionThe 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 To judge the zero fire wiredistinguish 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 Smart motherboard chipprofessionally upgraded chip control program with higher security and longer life Bright LightHigh-brightness work makes the measurement easier, still clearly visible in the sun, and has a longer life than ordinary bulbs Responsive Electrical Tester PenIt is more convenient to carry around for work, considerate design, and be attentive everywhere Product function: 1. Neutral line/live line detection: the test result LED red light and green light indicate live line, green light indicates neutral line 2. Detection along the line: LED light on means the line is unblocked, LED light off means the line is disconnected 3. Wire switch: if the plug and the inner core of the wire are intact, the light will be on, and if it is not on, it means that the core wire is in poor contact Specification: Model: B12 LED lamp beads: high-brightness 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 Color:Silver Package List: 1 x Responsive Electrical Tester Pen(no battery)