Please see:
There are videos showing proper operations and just how accurate/precise (repeatable) they can be (using a Bridgeport) - 0.001" or less. One of the videos SHOWS AND PROVES THAT RUNOUT IS NOT AN ISSUE with edge finder that is spun during use.
Remember that the Nomad isn’t reliably repeatable below 0.001" (0.0254 mm).
C3D is now selling a high quality American made edge finder.