Home Built Lathe 1 micron tolerance

i bought a half millionths DTI for goofs, if you breathe on the stylus the reading changes

Where did you find a 0.5 uin indicator?. Is it even possible for a mechanical devise to have such discrimination? Is this a gauge amplifier that you are describing as simply a DTI? I had once seen a 0.2um Mikrokatoron Ebay and have since believed that anything further had to be the domain of a elctro-mechanical devices.
 
Mike, that's actually 50 millionths. You need two more zeroes for a half millionth.
 
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