Keep all engines, from your car to lawn equipment, running smoothly with the Spark Plug Gauge. Gapping spark plugs is an essential part of every tune-up and this tool makes it easy. Check the depth of the gap between the electrode and ground strap by sizing it against the gauge, which ranges from 0.020" - 0.100". Use the adjustment hole to gently open or close the gap. This handy tool will keep your engines running at peak performance for years to come.
Tapered hole is designed to adjust spark plug gap without damaging the electrode