Hand press

[mcguyver42]

Well like fredk says,  I have measuring equipment that would curl your hair, inside and outside micrometers that read to 1 10,000th. (.0001) snap guages and dial indicators, antique German Helios calipers and depth guages in velvet lined wood cases, on and on.  That stuff rarely if ever gets used.  A cheap 1" mike and 6" caliper with direct read scales is really all most of us need.  Truth is, the human hand can easily discern ten thousandth's (.010) of an inch movement which is more than adequate for most everyday things until you start getting into high speed moving parts and then things tighten up a little but not much more.