I use a cheap stereo microscope that I scored at a pawn shop for five bucks. - You get amazing detail, see things that you never imagined.
Nice smooth, shiny cases look like a dirt road full of pot-holes. Stressed and stretched brass becomes impossible to overlook.
They are a lot of fun with bugs, edges on knife blades, and hundreds of other items too.
It's a real eye-opener, and I have found that I can hold my digital camera up to one of the eye-pieces for capturing images.