About this item

• ✉Working Principle✉ This new spark plug test pen determines the quality of the coil based on spark color and flash distance.
• ✉Easy to Operate✉ Nail the clamps onto the engine. Insert the other end into the spark plug wire. Read the length of the spark through a small window. The longer the spark gap, the stronger the coil.
• ✉Visual Window Design✉ The gaps between the measurement values are designed with white fonts, which allows the measurement results to be clearly displayed and easy to read.
• ✉Useful Tool✉ Screw assembly allows quick and easy spark gap adjustment. Avoid fire, ignition coil burnout, etc. You can quickly and easily diagnose whether your car power system is working properly.
• ✉Compact Design✉ This spark plug testing tool is so compact that it can be kept in your pocket and used at any time. In this way, you don't have to walk back and forth to get tools during the repair process, which can greatly improve your work efficiency.