- Power tester with spring wire: accurate and reliable detection to identify circuit faults quickly and precisely in automotive and electrical systems; 12V. - Mechanics tool for convenient operation: simple circuit testing in automotive and electrical fields; 12V circuit tester with wire. - Automotive tester for vehicles: essential tool for automotive technicians and DIY enthusiasts; reliable assistance in circuit testing and repair; circuit tester. - Versatile, heavy-duty tester: compatible across various car models; auto circuit tester for many makes and models. Use scenarios - In-vehicle diagnostics: test lighting circuits, fuses, battery connections, and ignition circuits to pinpoint faults. - Workshop electrical testing: verify 12V circuits in wiring harnesses and electrical panels across different car models. - DIY installation: safely check circuits before adding aftermarket accessories to prevent miswiring.