This toggleable overlay would be available on run mode (where the approximate size of the circle/cylinder to be measured is already known.) It would display the approximate location of the remaining touch points that would be required to complete the measurement via a dashed-line (see attached image). Said points would be evenly spaced and be based upon the first point measured.

This overlay would prove useful in the manual measurement of large diameters with a lot of touch points that ideally have to be as evenly spaced as possible (ex: 20 inch diameter with 20 points).