Pro mouse adjustment
What doe the three position adjustment ring under the (antique) Pro mouse do?
Question marked as
See the following from http://www.minimallyminimal.com/blog/apple-pro-mouse
Surrounding the optical sensor of the mouse is a dial that adjusts the click force setting of the mouse. The changes are minuscule, if not imperceptible. It’s no surprise that its successor had this function removed. Saves money and also reduces complexity.