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 Weight: 120g color: White Material: plastic metal Quantity: 1pcs Packing list: 1*Car spark plug tester Only the above package contents are included, other products are not included. Note: Reflection of light and different monitors may cause the item's color to be slightly different from the actual item. Measurements allow +/- 1-3 cm.