PURPOSE: To increase an efficiency by increasing a processing amount per hour when a next process is performed after the uniformity of a circular object is measured.

CONSTITUTION: Two stations are provided. A first station 1 receives a circular object 3, and a uniformity inspection is performed. First an angular position identification feature A positioned on the circular object 3 is detected. An angle C occupied, in the feature A, by an angle position B to be measured is determined, and its information is stored in a computer 4, and then the object 3 is moved to a second station. The second station 2 detects the feature A, calls out the stored angle information, and re-disposes the angle position B based on the feature A and angle C. Next, a mark D is stamped on the position B. If required, a marking process can be omitted.