Okay XJ600e is up on the plate for a GOM triple scan. This high end metrology system is as accurate as needed. Even with uncertainties of human operation apparently it will visually measure surfaces within accuracy levels of 10 microns. Had a couple of queries about the density of the reference dots but having seen examples it gives great results as long as it can read 3 dot at any time. Oh well will see how it all goes down after the holiday season.