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The GCT505M quickly and easily detects engine RPM and spark parameters. Useful for checking for ignition system faults and misfires, or for tuning and aftermarket modifications.


This tool will tell you exactly what’s going on with any spark ignition system as soon as you put its sensor by your coil (or spark plug wire). Swapping coils and other components in and out until you figure out what’s wrong is slow, tedious, and wasteful. The GTC505 will take the guesswork out, so you can be confident that the problem will be solved on your first try.



  • LPG powered Engines 
  • Marine outboard mechanics
  • Petrol inboard mechanics
  • Small engine repair shops doing fault diagnostics
  • Motorcycle technicians doing diagnostics or aftermarket modification
  • Automotive technicians looking for a GTC505 with all the extras


  • Mearures:

    • Eninge RPM
    • Peak Spark Voltage
    • Spark Burn Time
    • Dwell Angle
    • Ramp Time
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