In article ,
says...
I've had an entry level Mitutoyo unit for many years and its worked well for
me.
As far as additional features I wished it would have, it would be more
reference
points (the ability to save more x-y locations in memory) and a midpoint
calculation.


The ability to store at least two zero points and a
midpoint function are also much higher on my list of
desirable features than the bolt-circle function.

Ned Simmons