I'm beginning to assemble a set of measuring tools for use with my first metal lathe. As I'm not working for NASA, and my subcontracting days for them are probably a ways off, I figured I could get by with some used mics purchased on Ebay. The problem with that theory is that the choices are almost overwhelming. Are there any micrometer models I should actively look for or stay away from? I'm planning on sticking to some of the brand names I know: Starrett, B&S, Lufkin, Mitutoyo, etc. Sizes I want to look for run from 0-3", maybe 4" if I find a good deal. It sounds like ratcheting mics are better for the beginner, assuming they're in good shape? What else do I need to know? I know this is a really broad question and could be met with pages of discussion. I really just need a starting point, and maybe some model recommendations to buy or avoid. Thanks!