I'll add a couple more comments to the above. - I do all my measuring in decimal inches below one inch, usually fractional inches above. I find it so much easier to compare 0.095 to 0.078 (or 0,080) than trying to remember if 5/64 is bigger that 3/32. Metric of course rules, but was born in the old US of A. - the handiest tool in my quiver if the StewMac string action gauge - it makes measuring action simple. Its also a decent fret rocker and comes with some pretty reasonable generic setup specifications - I always measure the action at the 12th fret (I know lots of electric techs do it farther up the neck). By doing it the same way each time it really doesn't matter if I'm working on a mandolin or a double bass. It also makes the math much easier - to lower the action by X lower the saddle by 2X. - I understand which changes affect others and in what order. Changing relief will change the 12th fret action and slightly, the 1st fret action. Changing either of those actions will not affect the relief. Everything effects the intonation, changing the compensation has little or no effect on the others. - I also understand string gauges, tension, and tunings. In fact I almost always measure the strings that are on a guitar before I start work - you would be surprised how many players don't know whats on their guitar. - And I'll repeat, one more time, actually probably many more times, that before I change ANYTHING I measure EVERYTHING and write it down. Its pretty hard to tell where you are going if you don't know where you are starting And I suppose I should repeat that I will do a setup on a guitar with less than perfect frets but it will be a compromise. Why waste the time.