On 2011-11-18, Ignoramus4881 wrote:
A flatness gauge?

http://boss-proxy.chudov.com/tmp/tmp-0477.jpg.html

Looks like it -- for checking for worn spots in a surface plate
perhaps? Nope -- not nearly sensitive enough for that. The dial is
calibrated in steps of 0.001" and I think that you would want something
in steps of 10 u" (micro-inch) or perhaps 1 u".

Yes, it will measure flatness, but not to the degree needed for
a surface plate.

Enjoy,
DoN.

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