The cut surfaces are classified in the tolerance fields according to the maximum measured values. Therefore, the
measuring points shall be located where the maximum measured values are to be expected. When choosing the
measuring points due consideration shall be given to the fact that the maximum values of the mean height of the
profile and of the perpendicularity or angularity tolerance may be found at different points of the cut. If measured
values are located at the lower limit of a tolerance field, additional measurements should be carried out due to the
uncertainty of the visual selection of the point with the expected maximum measured value. If measured values are
located at the upper limit of the tolerance field or if there are any doubts regarding some measuring results,
supplementary measurements shall be carried out on the same number of additional measuring points.