Precise diameter measurement of the rotating elements and specify of the possible fluctuations, oval and taper of the rollers and the rings. Moreover our company has developed a device of “IN-SITU” and “REAL-TIME” dimension measurement that does not need to cease the production line. This device is patented and it is 100% reliable and verified. The usage of the technical measurement assures the quality of the processing diameters and also reports (before and after) for the condition of the rollers/rings. The last information has the potential of applying new settings in the bearings and the support points of the rotary kiln, in order to reduce nutations and power consumption but also to increase the life expansion and the performance of it. It also gives the opportunity of receiving preventive measures for future use.