*In the original post we stated repeatability on X and Y were 0. The use of significant digits was wrong. If you measure something with a wooden ruler and it is an inch wide you say 1 inch. If you measure with a caliper you might say 1.000 inch. Saying "0' implies it could be rounded by as much as 0.500"
While the eye can see the pointer only moved about a 1/5th of a tick on the scale, that does not mean the tool is that accurate.
The accuracy number I always give is 0.001 to 0.003. We do not guarantee all units will leave the factory at 0.001 on all axes.