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The most vexing thing about compression testing on Corolla engines of the 90's vintage is getting the tester fitting tightly screwed into the sparkplug hole. The typical tester has a braided tube, so when you are trying to screw the fitting in, you are using that tube to turn it. They don't have to be screwed in extremely tight, but you just don't have a good feel for how tight you are getting it. A tester with a rigid section on the end of the tube would be the better kind, but I've never seen one.
Some testers come with only GM fittings. One indication of a good tester would be that it would hold the max pressure reading for a long time, instead of making the lone mechanic turn the engine over and then run around to the engine compartment to read the tester before the air leaks out. I've never seen a tester that would hold the reading for more than 5 or 6 seconds.
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