Wondering what methods other fanatical tuners have come up with for measuring the sharpness of an edge. All of my fingernails are nearly worn through already and its only January! For me its mainly about deciding weather the edge needs a file or if I can get by with just some diamond stones and save the edge.
I have starting using a piece of PVC pipe - pulling it across the edge. A sharp edge will shave off the PVC just like it will my fingernail. I don't think I'll ever get quite the feel I can with a fingernail, but I can get a good judgement.
.Searching the internet I have found instruments that will measure metal edge sharpness but they start around $2K. Any ideas out there?