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Use to test spark plug circuits, electronic fuel injection signals and idle air control circuits. Quickly diagnose "no start_ and engine misses conditions in the electrical fuel injection and spark plug circuits. Analyze rough running engines. Supplied with instructions in a durable, plastic molded storage case. Includes: Cat. No. 23970, In-Line Spark Checker Kit for Recessed Plugs. This is a must for testing newer vehicles with recessed spark plugs.