Product Description: 1. Place your hand on the cap and touch the post, then insert the electric pen into the tension air. The electric pen lights up with two-color red and green lights. This is the live wire; 2. The motherboard professionally upgrades the chip control program, which is more secure and has a longer service life. 3. The electric pen touches the contact rod. If the inner core of the wire core is not damaged, the green LED indicator lights up. If it is not lit, it means that the wire core is in poor contact. 4. Detection along the line, the green LED is on, the line is normal, and the disconnection LED is not on Product parameters Product type: LED screwdriver electric pen Bit head material: vanadium steel bit head Measurement range: 24~250V Drill bit diameter: 3mm/0.1lin Battery model: 3 x AG3 button cell(battery included) Product material: anti-drop insulating ABS. Application: It can be used in electronics factories, electrical appliances, car maintenance, home furnishings, etc., with a wide range of uses. Product List: 5 voltage tester pen. Distinguish Live/Zero Line Just put your hand on the cap and touch the pole, plug the test pen into the air of voltage, the green light on the electric pen is the zero line, and the electric pen lights up with a two-color traffic light s for live wire Judgment of disconnection point The electroscope can quickly judge whether the line is normal and detect along the line. If the electroscope green light does not light up, it means the line is disconnected, if not, the line is normal. Electric switch detection The electric pen touches the rod of contact. If the inner core of the wire core is not damaged, the green LED light is on. If it is not on, it means the wire core is in bad contact. Humanized design The test pen is small and portable, the clip design is convenient for people electricians to perform maintenance, and the light can be turned on for easy identification Good ConductivityOur test pen is made of high hardness chrome vanadium steel, with good conductivity, and the motherboard professionally upgrades the chip control program, which is safer and has a longer service life.