The 10 Best Spark Testers
We spent 26 hours on research, videography, and editing, to review the top options for this wiki. If you're afraid your spark plugs are on their way out — and you don't want to risk getting zapped while using a screwdriver to check them — then one of these inline testers is just what you need. They can help you identify a multitude of ignition problems, saving you the hassle of having to take your car into the shop (not to mention hundreds of dollars' worth of diagnostics). When users buy our independently chosen editorial picks, we may earn commissions to support our work. Skip to the best spark tester on Amazon.