Prior to measuring with several sensors on one coordinate measuring machine, the offset positions of the sensors must be determined. A standard is measured using all the sensors that will be used. The material of this standard must reflect optical light, allow transmission of X-rays, and be able to withstand mechanical probe systems without damage.  The sphere shown is well suited for the task. Its center point is determined by measuring it with every sensor that is intended for use to determine the position of each sensor in the coordinate system of the machine. The different positions are then automatically considered by the software when using the machine. The result is that all of the measured features are given within a uniform coordinate system. It is not strictly necessary that the actual dimensions of the sphere are known, but the form must be of sufficient quality that the measured center points of the sphere depend as little as possible on the positions of the selected measurement points.