In-line Engine Ignition Spark Plug Tester

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The In-line ignition spark tester is a must have diagnostic tool for any engine that uses a spark plug. Easily diagnose ignition issues when your engine won't start. 


  • Quickly diagnoses ignition and engine issues
  • Well designed with a protection shield to prevent any electrical shocks
  • Saves time, frustration and money while offering a safe, secure way to identify spark
  • Universally compatible with all combustion engines that use a spark plug. Examples include cars, trucks, motorcycles, lawnmowers, trimmers, go-karts, scooters, etc.


  • With engine off, remove spark plug wire
  • Attach black connector to spark plug
  • Insert metal end of tester into spark plug wire
  • Try to start the engine
  • If ignition circuit is complete, the light will pulse/flash
  • The pulses should be bright and consistent