Main function: This probe pen is ideal for checking circuits, fuses, switches and wiring on cars, trailers, boats, motorcycles and other low voltage systems. Premium quality: The handle is made of AS plastic and the hardened and tempered carbon steel probe is chrome plated. Feature: Ground the alligator clip and insert the probe into the test circuit. The sharp steel probe can easily pierce the wire insulation to check the circuit. Convenient and practical: Test the circuit from 6V to 24V. After the circuit is connected, the light in the handle will glow. If the indicator light is on, it means that the power is on. Customer service: If you have any questions about our products, please feel free to contact us, our customer service will be happy to answer your questions at any time. Specification: Material: AS plastic, Carbon steel Handle Color: As the picture show Pen Length: 17.3cm / 6.8inch Probe Length: 8.3cm / 3.3inch Line Length: 96cm / 37.8inch Package Weight: 118g Quantity: 1pc Clamp Capacity: 20 AMP Bulb: 3 Watt Bulb (Replaceable) Voltage Range: 6V-24V Package included: 1 x Electrical Wire Circuit Tester