The Digital Centering scope is much more useful than the traditional optical Centering scope. To highlight these differences I have created a whitepaper Center Scope vs Edge Finder vs Touch Probe.
The centering scope can be used for referencing a Milling Machine and taking measurements. My Cscope Part 1 video takes you through how I use it for reverse engineering parts. Share your experience here if you have found a particularly useful application for it. Don't worry your email will not be public.