Spark Plug and Ignition System Tester Efficient, MultiFunction Testing Designed for quick and accurate diagnosis, this tool tests spark plugs, voltage ignition wires, and ignition coils. The builtin light indicator clearly shows whether a spark plug is functioning properly, allowing you to identify issues without piercing wires or dismantling components. Disassembly Operation Suitable for use in both ignition systems and circuit breakers, this tester features a grooved end that increases contact area for reliable readings. The brightness bulb delivers clear, visible results, making it easy to observe the status even in dim lighting conditions. Durable and Safe Construction Measuring 4.84 inches (123 mm) in length, the tester is compact yet sturdy. The outer casing is made from quality ABS material, offering durability and stable insulation to protect against electric shock. The transparent indicator ensures consistent visibility during use. Simple, Direct Use Start the engine, place the grooved end of the tester on the spark plug wire, and observe the light bulb. Flashing indicates the wire is successfully transmitting the spark signal. This straightforward method allows fast troubleshooting with minimal effort. Practical Applications 1. Diagnose misfires by checking spark plug and wire performance directly on the vehicle. 2. Test ignition coils in shops or during routine maintenance without removing components. 3. Verify spark transmission on motorcycles, cars, or small engines in both professional and home garage settings. This tester provides accurate results, saves time by reducing disassembly, and is built to withstand regular use while ensuring operator safety. Ideal for mechanics, technicians, and DIY enthusiasts who need reliable ignition system diagnostics.