Key benefits Diagnose electrical problems quickly and accurately: measures automotive voltage, current and other electrical parameters so you can pinpoint faults without guesswork. Faster, safer testing: spring wire plus an electrical clamp provide a secure connection that keeps your hands away from exposed terminals and speeds up repeated checks. Clear, reliable readout: LED digital display shows measured values directly and intuitively, reducing reading errors and helping you make fast decisions. What it does (functions) Measures voltage, current and related automotive electrical parameters for accurate system checks. Provides stable contact via spring wire and an electrical clamp for repeatable, hands-free or one-handed testing. Displays results on a bright LED digital display designed for quick interpretation in garage or roadside conditions. Compatibility and form factor Designed specifically for automotive electrical systems and common vehicle wiring applications. Handheld test-pen form factor with a spring wire and clamp attachment for easy access to battery posts, connectors and harnesses. Intended for use on typical vehicle circuits for troubleshooting and verification; the LED display supports clear readings during inspection. Performance and reliability Accurate digital measurement and a visible LED readout reduce diagnostic time and help avoid unnecessary part replacements. Spring wire and clamp design improves contact stability compared with loose probes, improving repeatability when testing the same circuit or component multiple times. Practical use scenarios Battery and charging system check: quickly read battery voltage at the terminals or monitor charging voltage while the engine is running to verify alternator performance. Wiring and connector troubleshooting: clamp to a circuit or use the spring wire to probe connectors and trace shorts, opens or intermittent connections in the wiring harness. Fuse, relay and accessory checks: confirm fuse continuity, test accessory circuits and verify current draw on suspect components before replacing parts. Why professionals and DIYers choose this pen Focused on automotive diagnosis rather than generic electronics testing, making it more convenient for vehicle work. Secure clamp and spring wire reduce fumbling at cramped connectors and speed up routine electrical checks. LED digital display gives clear feedback, improving confidence in readings and repairs. Usage tips Attach the clamp or spring wire to a solid ground or reference point before probing circuits for stable readings. Use the LED display to compare measured values against manufacturer specifications when evaluating components or systems. Avoid testing live high-voltage systems beyond typical vehicle electrical levels; use this tool for standard automotive circuits. What you get A compact, handheld LED test pen with spring wire and electrical clamp, built for efficient, accurate automotive electrical diagnosis.