Adjustable Spark Plug Tester, Inline Engine Spark Plug Ignition Detector

Tests for misfires. Practical for intuitively understanding the operation of the ignition coil. Easy to read - high-visibility white markings make it easy to read the measurement gap. Depending on the spark color and distance, you can determine the coil's condition. Screw mounting for quick and easy spark gap adjustment. Prevents the ignition coil from catching fire and burning out.