Spark Plug Tester, Adjustable Ignition Coil Tester with High-visibility Scale, Car Spark Checker Tool, Auto Diagnostic Test Tool, for Most Cars, Small Engines, Lawnmowers (Black)

1.This spark plug tester enables quick and accurate diagnosis of ignition system performance.2.Its high-visibility scale ensures easy reading of gap measurements from 10 to 40k.3.The adjustable knob allows precise gap control to match different vehicle requirements.4.The observation window lets you monitor spark length to assess coil strength.5.Universal design works for cars, small engines, lawnmowers, and more.6.Compact size and long cable make it ideal for use in tight engine compartments.

• High-visibility Scale: This spark plug tester features clear white lettering and precise graduations from 10 to 40k, enabling accurate gap measurements without confusion and saving time on vehicle maintenance.
• Adjustable Gap Design: This ignition tester includes a convenient circular knob for effortless gap adjustment, with a small observation window to monitor spark length—longer sparks indicate stronger ignition coils.
• Durable Construction: This diagnostic tool is built from robust materials that ensure long-lasting wear resistance, allowing spark inspection without engine ignition for safe and fast diagnosis in non-running conditions.
• Simple Installation: Installation is straightforward—connect the clamp to engine ground, attach the other end to the spark plug wire, observe spark length through the window, and adjust the gap as needed to identify weak coils and faulty sparks.
• Complete Kit & Compact Size: Measuring 4.53 inches total length with a 20.47 inches cable, this tester provides ample reach in tight engine compartments. Compact and lightweight for easy storage, with high-contrast markings for low-light readability.