- Sturdy and Durable: Made of ABS plastic, the circuit tester is strong and durable with excellent electrical and heat resistance. It provides a good grip for comfortable use over long periods. The fuse tester outer shell is insulating material to effectively isolate current and prevent accidental electric shock. - Multiple Voltage Ranges: This 20 cm / 7.87 inch long car circuit tester features a flexible spring wire for use in tight spaces. It supports a wide voltage range of 3V-120V DC, suitable for testing various vehicle circuits. - Convenient and Efficient: The pen includes a circuit tester with an alligator clip that firmly clamps the wire or ground point, helping prevent loosening during detection. The thick spring wire offers flexible handling for different tasks. - Wide Application: This car battery tester with alligator clips and an indicator light can detect power grounding and locate wire shorts and breaks. It quickly checks car headlights, taillights, turn signal circuits, faulty sockets, connections, fuses, and breaks. - Practical use scenarios: - In the engine bay to locate a blown fuse or a poor ground. - In lighting circuits to diagnose intermittent headlights or taillights. - In electrical harnesses to verify wiring continuity and spot shorts.