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  The principle of the least square of error determination places an ideal plane in the middle of the actual surface according to the trend of the actual surface, and minimizes the sum of squares of the distance between each point on the actual surface and the ideal plane
Taking the center plane of the least square as the evaluation base plane, the difference between the maximum value and the minimum value of the deviation of each measuring point to this plane is the flatness error value of the measured surface
In the diagonal principle, the plane passing through one diagonal of the measured surface and parallel to the other diagonal is taken as the evaluation base plane
The difference between the maximum value and the minimum value of the plane deviation of each measuring point is the flatness error value of the measured surface