Must-have diagnostic tool for any engine with a spark plug
When engine won't start, gives instant answer to 'does it have spark?'
Simple to use - just remove rubber boot from spark plug, insert tester & place tester boot on plug
Turn the engine over - if ignition is being sent to the cylinder, light in tester glows
Great time and frustration-saver with cars, motorcycles, boats, chainsaws, lawn mowers & more