- Wide Voltage Range (5-90V) for Versatile Use: The circuit tester supports 5V to 90V, suitable for 12V lights, automotive circuits, and household wiring. Ideal for testing car fuse circuits, checking relay connections, and general electrical screwdriver tester tasks. - LED Digital Display for Accurate Readings: Features an LED digital display that shows precise voltage levels, reducing guesswork. Quickly test power, ground, or continuity with clear, reliable readings. - Durable & Safe Design: Built with safety in mind. The power probe has a durable insulated handle to protect against electrical hazards. The circuit tester pen uses a heat- and electricity-resistant plastic handle for longevity, with a high-quality metal probe to withstand wear in daily use. - Coiled Spring Wire & Alligator Clips for Convenience: Includes a retractable spring wire (60 cm to 2.1 m) and alligator clips. Clips attach to negative or positive terminals, while the coiled wire provides greater reach and maneuverability in tight spaces. Useful for testing car lights, relays, or wiring. - Practical use scenarios: checking car fuse circuits, verifying relay connections, testing 12V automotive lights and general household wiring.