Best edge finder?

[TomG]

An edge finder is an essential tool on the mill. I keep one in the coolant trough of my vise so it's always within easy reach. As Willie pointed out, it's the best way to find the edge on a finished part if you need to add more features. Edge finding is done on the lathe as well, but it's normally done by just touching the edge of a shoulder or a diameter with the tool.

Tom