An interesting thread. I have used a digital caliper for height adjustments for a while, mostly because my old eyes can't see increments of 1/32 or less on rulers and such. But I have found a much easier method that is very accurate. A little known fact, but the human finger can detect very small variations, on the order of 1/1000 of an inch. Just raise your router plate 1/1000" and slide your index finger across with your eyes closed (router off, of course!). Most people can detect the edge. So with that knowledge, all that is really needed are blocks of the needed heights. There are the brass bars that many use, but I cut my own measurement blocks out of MDF. I haven't lost a bit of accuracy in my work, but set up tends to go much quicker since I put the digital tools away. Not that these tools are wrong, just not as efficient for me. YMMV.
Woodworking is more than a hobby.
It is a journey of discovery,
An application of innovation and creativity,
And an opportunity at self improvement.