Car Truck Circuit Test Pen, 3-24V / 3-70V DC LED Digital Circuit Tester,Auto Bidirectional Voltage Tester Electric Test Pen, Auto Voltage Tester Electric Probe Test Pen Handle is made of plastic and the hardened & tempered carbon steel probe is chrome plated. The sharp steel probe easily pierces wire insulation to check circuitry. Light in handle glows when circuit connection is complete. Test a range of circuits ranging from 3V to 24V / 70V. Light weight design and super convenient to bring with. How to use the product? 1. Hold the alligator clip of the measuring lead to the ground wire (such as the metal or negative pole of the car) 2. to measure the head of the electric pen needle contact to test the conductive metal in the circuit 3. If the light bulb of the stylus will , it means that the point under test has constituted a circuit and is working properly. Conversely, the point under test there is a fault, to be investigated. Type: Digital Electric Circuit Tester Voltage Range: 3-24V, 3-70V Cable length: 0.6m-1.8m Bulb: 3 Watt Bulb Material of Handle: Insulative ABS Application: Automotive headlights, taillights, turn signal circuits, faulty sockets, fuse connections, and other wirings and circuits. Caution: 1. Prohibit the use of more than the voltage test range of the pen. 2. The tip of the pen is sharp, please use with care, and placed in a place where children can not reach. color:Red+black Material:ABS Package Contents: 2 x Voltage Circuit Tester 1 Pair x Cut Resistant Gloves Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.