Features: 1.Connect the tester between the spark plug and the plug cable simply, the screw assembly quickly and easily adjusts the spark plug. The clips are securely clamped to the ground to prevent high-energy sparks from directly hitting any floor. 2.The normal spark is purple blue and the ignition is regular, abnormal spark color slants yellow, slants red, or indirect interruption. 3.You can quickly and easily diagnose whether the car ignition system is working properly with it, avoiding fire, burnout of ignition coil and etc. 4.It provides a secure and reliable way of fault diagnosis which is convenient, economical and time-saving. 5.Manufactured with premium material for long-lasting durability. Specification: Condition: Brand New Material: PVC Plastic Color: Black Quantity: 1pc Package Size: 20 * 11 * 3cm / 7.87 * 4.33 * 1.18in Package weight: 102g / 3.60oz