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If you need to verify ignition operation on your small engine vehicle, use the ABN Spark Plug Tester Kit - Ignition Coil Tester Small Engine Tool to determine which cylinder is causing the issue and track down the exact cause. Connect the ignition testers ends to the spark plug and the plug wire, then start the engine. The spark plug tester automotive spark indicator light will mirror the spark through light intensity. Access and replace old spark gap tester bulbs easily by disassembling the ignition spark tester tool. 11.3-inch spark tester small engine tools feature a 3-inch nickel plated shaft and a 7-inch rubber boot and cable for versatility when working. It can diagnose faulty ignition coils in cars, motorcycles, lawn mowers, boat motors, chainsaws, and more. WARNING: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.