Inline spark tester/test plug for small engines Tests spark directly in ignition circuits to help verify ignition performance and identify faults. Small engine tool design Built with workmanship, durability, and precision to help ensure stable performance in small engine ignition systems. T tool compatibility T tool can be used in electronic ignition systems and circuit breakers, providing convenient testing in workshop or field settings. Ignition accessory design Pen clip design for easy carry and storage; simple application, durable and practical to use. Use scenarios - During routine maintenance on lawn mowers, generators, and snow blowers to verify spark and diagnose ignition issues - On-site testing of electronic ignition systems and circuit breakers in portable equipment during field service - Keep in repair kit for quick spark checks during maintenance and troubleshooting of small engines