Description: Material: Made from pp material, this automotive spark plug tester is built to withstand regular use while maintaining its reliability and accuracy Product Size: With a convenient size of 14cm, this ignition spark tester is easy to handle and store, making it a practical addition to any mechanic's toolkit Transparent Window Design: The Ignition coil tester adopts a transparent observation window design, which is convenient for observing the jumping situation, confirming whether it is normal, and easy to use Ignition Coil: Judge the coil by the color of the spark and how far it jumps. The normal spark color is purple, blue, and the abnormal spark color is yellow, red or indirect interruption Testing Tool: This automotive high-voltage wire and ignition coil tester is designed to effectively diagnose and test your vehicle's ignition system, ensuring optimal performance Specification: Material: PP Size Chart: 14cm/5.51inch Package Includes: 1 Piece Automotive Spark Plug Tester Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.