Voltage Tester Smart Induction Tester Pen for Household Line Breakpoint Detectio Black.Voltage tester with pen type design, lightweight and compact size, easy to carry.Smart induction tester pen with LCD display and Light, suitable for measurement in various environments.Touch the pole with your hand and insert the metal tip the pen into the hole. The red screen and beep sound are the live wire; displays the voltage of 0V and is the zero wire.The metal probe of tester easily pierces wire insulation to check circuitry.Multifunctional measuring tool for DC Voltage detection, On off testing, Resistance test. Great for checking circuits, fuses, switches and wiring in cars.Smart Induction Tester Pen Voltage Tester. Voltmeter Light Tester Detection LCD Digital. Fuse Voltage Tester with Illumination Protection. Electricity Detect Pen Flashing Alarm Screwdriver. Non Contact Voltage Tester Pen Tool Voltage Test.