Description：Sharp steel probes easily pierce wire insulation to check circuits. Probe pens are great for checking circuits, fuses, switches, and wiring in cars, trailers, boats, motorcycles, and other low-voltage systems. Ground the alligator clips and test the circuit with the probe. If the light comes on, there is power.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 circuit3. If the light bulb of the stylus will light up, 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 investigatedProduct parameters：Material: plastics, carbon steelColor: as shownClamp capacity: 20ABulb: 3 watt bulb (replaceable)Voltage range: 6v-24vPen length: 17.3cm/6.8inchProbe length: 8.3cm/3.3inchWire length: 96 cm/37.8inchPackage weight: 125 gramsQuantity: 1 pcProduct List：1*Power measuring penCaution:1. Prohibit the use of more than the voltage test range of the pen 2.3. The tip of the pen is sharp, please use with care, and placed in a place where children can not reach