Description: 【Multi Functions】Zero/ live wire determination, line breaking point judgment, electrical switch detection, contact voltage sensing, voltage detect pen can accurately detect voltage, effectively preventing the risk of shock. 【Bright Light】The screwdriver electric pen tool is designed with high brightness light indicators, which makes measurement easier and clearly visible even in sunlight during the day. 【Electrical Switch Detection】This Electric Pen contacts the contact rod, if the inner core of the wire is not damaged, the Green light will light up;If it is off, the inner core of the wire is in poor contact 【Versatile & Portable】Compact size electric test pen tool is convenient to carry whether you use it at home or take it out for working. Can be used in electronics factory, electrical appliances, automobile maintenance, household use, electricians tools. 【Ergonomic Handle】 Electric Pen Circuit Tester Pen with non slip handle improved comfortable hand feeling and control. Specification: Material: PP, Alloy steel Size Chart: Total Length: 16.8cm/6.61inch Package Includes: 1 Voltage Tester Screwdriver(3 Pack) Note: (1)Zero/ live wire determination: Hand touch cap test socket,the green light is the zero line, and the traffic light is the fire line. (2)Voltage sensing:The green light will turn on when a voltage is sensed. (3)Line breaking point judgment:Check along the wires, where the green light disappears is the breakpoint. (4)Intelligent chip: the main board professional upgraded chip control program, higher security, longer service life.