This article is from the Woodworking FAQ Collection 1, by multiple authors.
TS-Aligner can make linear surface measurements to less than 0.001".
It can follow a miter slot with no measureable play. It can resolve
the squareness of an object to within +/-0.001". It can resolve angles
to better than 1/10 degree by itself, and to within 1/60 degree when
used with standard machinist's angle blocks.
 
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