What accuracy testing standards do you use?
LMI uses a VDI/VDE ball-bar test to determine the accuracy of its scanners. For this test two spheres are mounted on a ball bar of know length. Scans are taken of the spheres as the bar is positioned in various orientations throughout the scanner's field of view (FOV). For each scan the distance between the spheres, calculated based on the scan data, is compared with the nominal value. The largest error at any location said to be the accuracy of the scanner.
Note: HDI Advance scanners are field-calibrated, so the scan data accuracy will depend on following good calibration technique.