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Sorry I wasn't clear on that, Joe. My thumb test is running perpendicular to the blade, not parallel to it -- same as you described. I remember the discussion where some guy preferred running his...

You might be surprised. Skin is surprisingly tough, and the skin on your hands is much tougher than the skin on your face.

Wet your thumb and run it over (by which I mean across, not with) the blade. A sharp blade will feel kind of sticky, a dull blade won't.

This test takes some calibration. I suggest getting a...