One of the things that I stumbled across was a digital microscope that could be used for electronic inspection of circuit boards and components.
I tried this once before with a USB camera , but the lag from the camera to the screen made it useless. These were different.
HDMI camera , no lag and high resolution. Like anything else in life, the better quality ones were not cheap. 
When I got home I kept thinking about the whole idea......so here we have it........ DIY
Please excuse the mess, it is set up down in my milling room right now.......I'm using it to do some surface mount soldering.
The photos have been reduced in quality so I could upload them here due to file size restrictions.
Very happy with the end result. No lag, great big picture. Less than $100 Cad. (some frugality required). The monitor is a 22" but it rotates on the base and it makes the foot print a little smaller. The monitor also has powered USB ports on the back which means I can power the camera directly from the monitor.
I can see me using this with my watchmakers lather, surface mount soldering and watchmaking.
I stole the whole idea from here....
https://www.instructables.com/id/Raspbe ... icroscope/
