- Grooved end provides a larger contact area with wires and components, delivering more accurate test results. - High-brightness bulbs and a transparent observation window make it easy to observe results at a glance. - Insulated handle offers safe handling when testing plugs, ignition coils, and circuit breakers. - Cordless and portable design means no cables to manage; convenient to carry and use in tight engine bays or on the go. - An essential tool for automotive inspection and maintenance, suitable for a range of electrical tests. - Use scenarios: - During tune-ups, test spark plug wires and ignition coils for proper operation and continuity. - Inspect vehicle electrical circuits by testing circuit breakers or fuses in the power distribution area. - Verify wiring harness connections and plug interfaces during engine repairs or diagnostics.