The sheet thickness is an important process parameter for tool and machine protection e.g. straighteners, for the assurance of the product quality according to ISO 9000 in blanking or slitting lines or to monitor the cost of the purchased materials. Roland supplies single-sided measuring systems as well as noncontact dual head systems. The measurements are based on magnetic, inductive and capacitance sensor principles. Detailed protocols according to SPC requirements provide objective basis for negotiations with the suppliers.