Gene Heskett wrote: > > How about one of those water soluable magic markers with a felt tip about > 1/2" wide, those should work, and I've used them for that before. > > If you want to find interference in tight fits like tapers, that will probably work, but it is no good for wide, flat surfaces, as the PSI is extremely low. If you apply any force, even the weight of the straightedge, it will force the straightedge down onto the surface being tested, and so you will get a wrong impression that the surfaces are both flat.
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