Spark Plug Tester – Accurate, Reliable, and Easy to Use Ensure your vehicle's ignition system is performing at its with this versatile spark plug tester. Designed for quick and precise diagnostics, it helps you identify issues before they become costly repairs. Key Benefits and Features: MultiFunction Testing: Quickly check spark plugs, voltage ignition wires, and ignition coils without piercing the wires. Visual Diagnostic Feedback: Builtin LED light provides immediate visual indication of spark plug operation. Easily see test results, even in dimly lit conditions. Durable Construction: Made of quality ABS material for longlasting use. The casing offers stable insulation to prevent shocks and ensure safe handling. Size: Compact 4.84inch (123 mm) length makes it easy to handle and store in any toolbox. Smart Design: Grooved end increases contact area between the tester and wire, improving signal detection accuracy. brightness bulb makes results easier to observe. Versatile Use: Suitable for both ignition systems and circuit breaker checks. How It Works: 1. Start the engine. 2. Place the grooved end of the tester against the spark plug wire. 3. If the LED light flashes, the wire is properly transmitting the spark signal. Practical Applications: Diagnose faulty spark plugs before replacement to save time and cost. Verify ignition coil and wire performance during routine maintenance. Troubleshoot inconsistent engine starts by testing ignition signal transmission. This spark plug tester delivers reliable results with safe, easy operation—an essential tool for mechanics, DIY automotive enthusiasts, and anyone who wants to maintain a dependable ignition system.