Hi all,I am looking for advice on which microscope is the best for analyzing sharpness. Intent: observe plane blades and chisels after individual/successive sharpenings on various media. I.e. Oil stones, waterstones, Arkansas, ceramic, strop, etc.I don't think I can afford an electron microscope. Who knows, maybe the prices have come down over the years. Maybe there's an electron microscope app for my iPad...... Any advice on an affordable microscope that will allow me to make meaningful observations would be appreciated.Thanks,Dan