I recently picked up a Starrett Height Transfer gage.... really nice piece of equipment as it's very easy to dial in 1/2 millionth or better... try that with one of those popular cheap Chinese Mitutoyo knock offs. Actually even the original isn't Mitutoyo isn't great for this kind of thing.
I am thinking about getting a gaging amplifier and a probe to play around with. Anything I should be aware of, as I've never used one.
Are you sure about the one half millionth? That's one 20th of one tenth. I think thats the thickness of a helium atom? lol
Seriously though, the last place I worked had them in every room, they are the bomb for sure. What I liked is you could check over 20 inches well within a tenth all day long. I wish I had one on my surface plate. Maybe with the economy the way it is we will be able to pick them up for 20 bucks at auctions.
As far as the gaging amplifiers, theyv'e actually been around for 25+ years. People seem to use them a lot when using long point indicators. It can turn a 3" long point indicator into one capable of showing a half tenth of movement if you have things rigid. Pick up an old used one and hook new indicator tips to it, the technology is the same as it is now, except maybe the backround paper will be yellow, but the precision of the needle and electronics is prolly better the older it is.
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