What do you use to inspect your edge? Loupe? Digital handheld "microscope?" I have watched a bunch of DrMatt's videos on youtube and really like the idea of being able to actually see the progress of scratch removal. In his videos, he uses a Veho digital "microscope." I am eyeballing a Celestron 5 MP Handheld Digital Microscope Pro on Amazon, but don't know if it would be worth spending extra for it. I am partial to the Celestron brand because I have one of their fine telescopes. Any input is appreciated.