Versatile automotive electrical tester - Can test car batteries and alternators, injector coils and ignition coils, and functions as a coil tester and pulse tester. Suitable as a general circuit tester and car fuse tester for a wide range of automotive electrical work. User-friendly operation - Easy-to-navigate interface that enables quick testing without prior knowledge. Designed to function as a straightforward circuit tester and car fuse tester, reducing the need for specialized training. Portable and compact design - Compact, handy form for easy portability. Lightweight enough to carry in a toolbox or glove compartment, and capable of testing spark plugs on site wherever you are. Accurate measurements for reliable results - Provides precise voltage readings for car spark plugs, helping verify component health and contributing to smooth, efficient engine operation. Use scenarios - Roadside readiness: check the battery and alternator before a long trip to prevent unexpected breakdowns. - On-site diagnostics: diagnose engine misfires by testing spark plug circuits and ignition coils during maintenance or repair. - Routine service: quickly assess injector coils, ignition components, and electrical circuits to ensure proper function and fuse status.