Parameters: Product name: digital display test pencil screwdriver Test range: 12~250V Alarm mode: buzzer/dual color light/digital display Product length: 173MM Breaker head material: Vanadium steel with magnetic bit Screwdriver specifications: ten/slot 18MM exposed screwdriver head Detection frequency range: 50~60Hz Display mode: analog bar digital display voltage Shell material: rubber-coated handle, anti-fall insulation Product power supply: AG13/LR44 button battery*3 (built-in battery for delivery) Description Neutral and live wire identification function: the red and green lights are on for live wires, and the single green light is on for neutral wires Intelligent motherboard chip: higher safety performance and longer life Voltage sensing without leakage: when the nearby voltage is detected, the LED green light is on for contactless electricity measurement to prevent the risk of electric shock Triple prompts on the sound and light screen: digital voltage display, high-brightness color light prompt, buzzer alarm Rubber-coated handle insulation without leakage: safe and reliable electricity measurement, anti-fall protection Measurement function/technology: Zero-live wire detection (zero-live wire can also be measured even if the built-in battery is dead) Non-contact voltage detection/line breakpoint search/electrical on/off Package includes: Electricity test pen*1