Spark Plug Tester A practical and efficient spark tester that makes troubleshooting the ignition system quick and easy. The transparent design provides a clear indication of spark quality: Bright white spark: strong and properly functioning ignition Irregular or weak light: unstable or weak current No light indication: no spark at all Specifications: Type: Inline spark tester Visual indication of spark strength Metal head for easy installation Transparent, impact-resistant plastic housing Heat-resistant cable and rubber boot Replaceable bulb The tester is easy to use: connect it directly to the ignition cable, ground the metal part, and start the engine. The built-in light instantly shows whether the spark is correct, even under load.