- Powerful functions: detects fuses; detects positive and negative power supplies of electrical appliances; assesses battery performance; tests LAN circuits; distinguishes real current from phantom current and identifies poor grounding; reads fault codes; detects Hall sensors; locates line short circuit faults. - Wide use: the 6-24V automobile circuit detection pen is suitable for maintenance of low voltage circuits in automobiles, motorcycles, excavators and other equipment. - Integrated structure: the automotive fuse tester has an integrated probe protection cover to prevent loss, and its compact design makes it easy to carry. - Tester light bulb: this LED test light circuit tester bulb offers high visibility and long service life; it indicates circuit state with a green light for positive polarity and a red light for negative polarity. - Use scenarios: diagnose a car electrical fault by checking fuses, battery health, and reading fault codes; in motorcycles verify battery performance and grounding to locate issues; in excavators or similar equipment test LAN circuits, detect Hall sensors and short circuits to support quick maintenance decisions.