Why is the cup type measuring device used?
The cup type measuring device with the tape centered on the top was included because it is extremely accurate since there is very little clearance in the cup for the pallino, the tape can be locked with the first measurement to the outside diameter of the bocce ball, and nothing is moved as the tape is simply rotated to see where the locked tape tip is relative to next ball measured. The tape actually does not need any measurement markings on it. Various known measuring devices were included in the standards with no intent to preclude other reliable measuring devices.
