If outside I try to use the sun at such an angle that it reflects off the edge I am filing. If I see a reflection it's still dull. No reflection...good.
On a bench I'll set up a light to try to get that same effect.
I keep a Sharpie marker in each saw case..mark the starting point like Butch.
I have an old version of this that I use when I sharpen...keep it in the trailer with the saws:
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