Feature 1According to spark color and flash over distance to determine the quality of the coil 2High visibility white lettering makes it easy to read the gap measurement from 0 to 40k 3The round knob provides easy gap adjustment and comes with a shielded clip securely fastens to ground 4Can intuitively convenient to understand the operation of the ignition coil 5Avoid fire, the ignition coil burned out and so on Description: This product is the quickest way to test for no-start conditions. It works according to spark color and flash over distance to determine the quality of the coil. What's more, the standard plug wire tip and can be unscrewed so the tester can be used on small engines and some motorcycles.The round knob provides easy gap adjustment and comes with a shielded clip securely fastens to ground. Wish you a happy purchase! Features: 1. It is the quickest way to test for no-start conditions. 2. High visibility white lettering makes it easy to read the gap measurement from 0 to 40k. 3. The round knob provides easy gap adjustment and comes with a shielded clip securely fastens to ground. 4. The standard plug wire tip and can be unscrewed so the tester can be used on small engines and some motorcycles. 5. According to spark color and flash over distance to determine the quality of the coil. 6. Can intuitively convenient to understand the operation of the ignition coil. 7. Avoid fire, the ignition coil burned out and so on. Specifications: Material: ABS + Metal Color: Black + Red Total Length: 11cm / 4.33" Diameter: 22mm / 0.87" Cable Length: 520mm / 20.47" Package Weight: 95g Package Included: 1 x Ignition Coil Tester Note: 1. An inductive test Cannot be performed, because there are no plug wires. 2. Please allow 1-3cm error due to manual measurement. Thanks for your understanding. 3. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.