If you are only using them some of the time, get the mechanical versions because every time I go to use one of the electronic calipers, or indicators, the batteries are dead. I don't have any brand advice because the really good quality stuff is pretty expensive and may be overkill unless you are machining parts. Usually if you just need to measure to 0.001" some of the lower priced tools will work fine, but you may want to get some standards to see how far off they are?
