Having car trouble and not sure if your spark plugs or ignition system are working properly? This handy spark plug tester pen makes diagnosis a breeze! The grooved end design creates a larger contact area between the wire and instrument, ensuring accurate test results every time. It features a high-quality light bulb that provides bright, clear indications that are easy to see even in well-lit garages. At about 125mm long (4.9 inches) and 10mm in diameter (0.4 inches), it's compact enough to fit in your toolbox or even your pocket, with a convenient pen clip for easy storage. Here's how it works: when the engine is running, just place the grooved end on the spark plug wire - if the bulb flashes, you know the wire is transmitting spark properly. You can use it to test spark plugs, coils, and distributors in both electronic ignition systems and circuit breaker systems. This is definitely more of a professional-grade tool, but it's straightforward enough for DIY enthusiasts who know their way around car engines. Instead of guessing what's wrong with your ignition system, this tester gives you clear visual confirmation of what's working and what's not. It can save you time and money by helping you pinpoint exactly which components need replacement instead of just throwing parts at the problem. Every serious home mechanic should have one of these in their diagnostic toolkit!
Free 30-day returns 
Free 30-day returns
