The auto measurement of thickness works reliably up to 50mm, and is repeatable to about 0.5mm, i initially used it via the touchscreen and cancelled the job just to find thickness, but now i use web browser and adjust x y coordinates in the address, e.g. my machine is ip ending 68 so I goto 192.168.0.68:8080/api/request_Laser_Material_Thickness?x=232&y=178&feedRate=1500
Shiny things work unreliably so add a piece of paper (0.1mm) or tape while measuring.