Pen-style voltage probe for low-voltage electrical troubleshooting Key benefits Faster diagnostics: The sharp steel probes pierce wire insulation easily so you can test circuits without stripping wires. One-handed operation in tight spaces: A large alligator clip secures to a wire or chassis, freeing one hand and allowing you to reach confined areas. Clear polarity and voltage feedback: Built-in LED indicators show circuit state and polarity (red for positive, green for negative); brightness changes with measured voltage so you get an immediate sense of signal strength. Long-term serviceability: The indicator LED is replaceable, extending the tool’s useful life. What it does Tests continuity and voltage in low-voltage systems by contacting the conductor with the probe tip and clipping the alligator clip to a reference ground or power point. Supports bidirectional testing — attach the alligator clamp to either negative or positive ground and read polarity from the on-board LED. Key features Probe material: durable steel tips that pierce insulation for quick access. Clip: large alligator clamp for secure connection and easier reach into tight or awkward locations. Indicator: on-board LED that indicates circuit state; brightness varies with measured voltage and can be replaced. Polarity: LED color indicates polarity (red = positive, green = negative). Suitable for: cars, trailers, boats, motorcycles and other low-voltage electrical systems; ideal for circuits, fuses, switches and wiring. Typical use scenarios Automotive wiring repair: Pierce the insulation on a vehicle wire to confirm power to an accessory or track a short without cutting or re-terminating the harness. Trailer or boat lighting checks: Clip to chassis ground and probe tail light or cabin wiring to verify voltage and polarity at connectors in confined mounting areas. Motorcycle electrical troubleshooting: One-handed testing of fuses, switches and harness sections where space is limited and rapid diagnosis is needed. Notes for use Designed for low-voltage systems; follow standard safety practices for working on vehicle and marine electrical systems. The LED indicator is replaceable to maintain long-term functionality.