The humble spark plug is one of the easiest ways to improve the performance of your engine. But it is often neglected and forgotten about inspecting and changing your spark plugs regularly which will not only improve how your machine runs but can also be used to diagnose other problems.

The ignition spark tester provides an easy way to eliminate the ignition coil as a cause of problems when you're having a no-start with no fire situation. A PDF manual is provided for download.