A new calibration system for up to a middle size CMM is developed. The spatial coordinate comparison method is realized for the practical system by applying direct coordinate comparison between the reference CMM and the object one. Following to the first report describing the basic concept and its primary evaluation result, the second report studies a noble method to analyze statistically estimated reliability of the calibration result. The experimentally obtained parametric error on a real CMM is assessed by comparing it with that obtained by the laser interferometer. The assessment result shows that the proposed calibration system estimates the parametric error with in the statistically predicted reliability range. Meeting demand to recent calibration technology, the practical calibration system with indication capability of its uncertainty is realized.