@GB Features: - Sharp steel probes can easily pierce wire insulation to check circuits. - The probe pen is ideal for checking circuits, fuses, switches and wiring in cars, trailers, boats, motorcycles and other low voltage systems. - Ground the alligator clip and test the circuit with a probe. When the light is on, there is electricity. Instructions: - Clip the measured alligator clip to the ground wire (such as the metal or negative pole of the car) - Measure the conductive metal in the test circuit with the needle of the electric pen - If the light bulb of the stylus will light up, it means that the measured point has formed a circuit and works normally. On the contrary, there is a fault at the measured point, which is to be checked. Product Specifications: - Material: ABS+metal - Color as shown - Clamping capacity: 20A - Bulb: 3 watt bulb (replaceable) - Voltage test range: 6v-24v; - Pen Length: 17.3 cm/6.8 inches - Probe Length: 8.3 cm/3.3 inches - Cord length: 96 cm / 37.8 inches