"MEASURING SYSTEM;MEASURES GEOMETRIC RELATIONSHIPS AS CONCENTRICITY,AXIS ALIGNMENT,SQUARENESS OF A FACE OR SHOULDER TO THE PART AXIS AND THE FLATNESS AND PARALLELISM OF FACES NORMAL TO THE AXIS;FOR DIAM. 21 IN.,FOR LENGTHS 30 IN.,FOR WEIGHTS 100 LBS,CHARTS-OUT-OF-ROUNDNESS,SURF ACE TEXTURE;ITEM IS RECOMMENDED WHEREVER THE HIGHEST DEGREE OF ACCURACY IS RQRD IN MEASURING THE FORM AND SURFACE TEXTURE OF ROUND PARTS WITHIN ITS SIZE AND WEIGHT CAP."