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Fortunately, the actual effect of a variation in height due to symetrical wear on the "V" is really negligible until you get under 1/2" diameter. The error varies inversely as the square of the diameterThere is a file named "Tailstock Height and Bed Wear Errors.PDF in one of the Atlas folders in DOWNLOADS that gives hard figures down to as I recall 1/4" diameter. Fortunately, the odds of your trying to machine anything that small that is long enough to extend from the worn area into the unworn area are two-fold, Slim and None.
To evaluate the vertical wear on a V-bed, you need to register your indicator on a flat part of the bed that nothing runs on. To evaluate the effective horizontal wear, you first use a dead nuts on straight edge that is long enough to bridge the worn area. Determine with feeler gauges the wear at the center of the worn area. Then the horizontal component is that amount times the Cosine of half the included angle taken on a new "V".
To evaluate the vertical wear on a V-bed, you need to register your indicator on a flat part of the bed that nothing runs on. To evaluate the effective horizontal wear, you first use a dead nuts on straight edge that is long enough to bridge the worn area. Determine with feeler gauges the wear at the center of the worn area. Then the horizontal component is that amount times the Cosine of half the included angle taken on a new "V".