Wide range of applications Ideal for automotive , electrical circuit testing, and more. Serves as a bidirectional voltage tester and a fuse checker tester for cars, providing versatile capability for various tasks. Durable performance Engineered for durability to ensure consistent and reliable performance over extended periods of use. Functions as a voltage tester and a trailer wire tester, supporting longterm reliability in demanding environments. Extensive applicability Suitable for a wide range of uses, including automotive and electrical circuit testing, meeting diverse needs. Also described as a test pen and an electrical tester pen for flexible handling. Convenient noninvasive function Acts as a noninvasive tool for electrical circuits, providing a practical solution for maintenance tasks. Also used as a power tester and power circuit probe tester for quick, noninvasive checks. Practical use scenarios Automotive diagnostics: verify voltage presence, test fuses, and inspect car wiring harnesses during or maintenance tasks. Trailer and towing systems: check trailer wiring circuits and connectors to confirm proper signaling and power delivery. Electrical maintenance and troubleshooting: perform quick, noninvasive tests on live circuits to locate faults without disassembly.