(This item pertains to the check boxes on the General tab of the Setup Options dialog box. You can open it through the F5 key or through the Edit | Preferences | Setup menu option.)
The Find Nominals check box controls how PC-DMIS treats hits. When selected, PC-DMIS will then automatically consider each probe touch, finding the closest CAD nominal for that touch. It will continue to accumulate hits until the END key is pressed. The feature type will then be calculated and the CAD nominals applied.
Once selected, the Find Nominals Tolerance box becomes available. See "Find Nominals Tolerance".