• Easily connects between the spark plug and spark plug wire • With the engine running, the tool flashes a mirror image of ignition spark • Quick and easy test helps check the condition of the ignition system at each cylinder • Troubleshoot dirty spark plug connections, defective points, bad cables or connections, and more • Shows voltage to plug, a stronger voltage will create a brighter light • 5 in. Spark plug connection, overall length 8-1/2 in.
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