Tool Aid 23970 in-Line Spark Checker Kit for Recessed Plug

Provides information not available with OBD II code reading devices - pinpoints if there is a spark plug, plug wire, mechanical, fuel injection or electrical problem.Shows a duplicate view of the ignition spark so technician can visually check condition of ignition system at each cylinder.Use for testing newer vehicles with recessed spark plugs and conventional and coil-on plug ignition systems.'