Not really obscure but definitely not common. USB microscope.
This was a pic taken from it, but the beauty is in the live feed to your computer screen. The image is HUGE!! I use Quicktime on Mac.
Do you use this to solder wires onto your boards? And does it help?
Also: This thread is amazing. I am enjoying DarkMatter's drill bit; it's much smaller than my contraption involving a hole cutter that fits into sink tube, the MHS sink-tube adapter, and then whatever MHS parts I screw into that. I have a blank 2" blade holder which I have converted into a tool to spin blades for sanding. I find that a clear blade with a sanded outside and either another trans blade or blade film inside the clear, sanded blade gives a nice core+halo effect.