- Expanded Voltage Range: This electrical tester offers a wide testing range of 5V-120V, making it suitable for diagnosing car battery voltage and identifying issues. It includes alternator testing capabilities for various vehicles, including cars, trucks, SUVs, and boats. Additionally, it checks the integrity of headlights, taillights, and fuse connections. - Clear Digital Display: The bright LED display provides clear readings in any lighting condition, with a 0.1V resolution for precise digital readouts. A bidirectional light-emitting diode on the circuit board simplifies battery load testing, where a red light indicates positive polarity and a green light indicates negative polarity. - Flexible Spring Wire: The high-quality 96-inch spring wire enhances flexibility during testing, while the anti-bending design ensures durability. Equipped with a large alligator clip, it allows for convenient one-handed operation, improving efficiency for car battery capacity checks and other applications. - Durable Construction: This advanced car fuse tester features a built-in circuit board chip and a plastic handle for better grip and insulation against electric shock. The robust stainless steel probe easily penetrates insulation, making it ideal for hard-to-reach areas. Use Scenarios: 1. Quickly diagnose a car battery issue while on the go, ensuring your vehicle is always ready for the road. 2. Test the integrity of your vehicle's lighting system before a long trip, preventing potential safety hazards. 3. Perform regular maintenance checks on your boat's charging system to ensure reliable performance during your outings.