Cordless automotive electrical tester with a grooved end for improved contact and accuracy Grooved end increases contact area between the wire and instrument, delivering more accurate test results. brightness bulbs and a transparent observation window make test results easy to observe and interpret. Insulated handle provides safe operation when testing plugs, ignition coils, and breakers. Cable, portable design for easy carrying and use in tight spaces or on the go. An essential tool for automotive inspection and maintenance, suitable for routine checks and diagnostic work. Key benefits Improves measurement reliability by enlarging the contact surface between the wire and the instrument. Enables quick, clear visibility of results without guesswork. Enhances safety through an insulated grip during testing of electrical components. Offers true portability with no cables to manage, supporting efficient field and work. Function and compatibility Purpose: electrical testing of automotive systems, including plugs, ignition coils, and breakers. Compatibility: designed for automotive wiring connections and common electrical components encountered during inspection and maintenance. Performance: provides clear observation of results with bright illumination and an unobstructed viewing window, while maintaining safe handheld operation. Use scenarios Onvehicle diagnosis of ignition coil and spark plug connections to verify proper signal and continuity during roadside or in service. Inspection of electrical wiring harnesses and circuit breakers in the engine bay or electrical compartment to identify faults or weak connections. Quick field checks during fleet maintenance or adhoc diagnostic tasks in constrained spaces, where a cable tool improves accessibility and workflow.