The tester I have for flywheel magnetos was used in a mower shop years ago and it came with no operating instructions and the company that made it in the late 50-60's is no longer, but by asking in a lot of places and with some common sense I worked it out. It has the ability to test point condition, condensor strength and coil condition both cold and then can heat it up and test again to see if it has lost any condition. My multi-meter took me ages to get one that done everything needed and now some of the steps I have down pat but I have a mate who helps sort my head out around issues I have, so slowly getting there.