Equipment Review GTC505 Ignition Analyser 

Me too! It's great for finding double or multi firing cylinders even though an inductive timing light or tach works this is much easier to use when running at speed in many situations. Once I got familiar with it and it's limits I have found myself grabbing in and using it each time I suspect an ign problem. I use it on everything from small tiller handle engines to the biggest outboards, stern drives and inboards.