Current Help System: PC-DMIS Laser (View Core Help)

### Surface Finish

Because tactile probes are larger than the deviation in most surface finish, a tactile probe acts as an averaging filter. When the tactile probe comes in contact with the surface, it gives an average of the highest points on the surface. When using a laser sensor, the light reflects off the surface of the part. How the light reflects, depends a lot on the roughness of the surface, even if it does not appear rough to the human sight or touch.