The Briggs & Stratton BS84003327 Spark Tester (part #19368) is a diagnostic tool designed for testing spark plug ignition in small engines. This tool allows you to quickly determine if there’s a spark in the ignition system, helping diagnose issues with lawnmowers, generators, and other outdoor power equipment. Easy to use, the tester connects between the spark plug and the ignition wire, indicating the presence of a spark when the engine is cranked. This durable tool is ideal for DIYers and professionals alike, ensuring accurate troubleshooting and reliable engine performance