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I have heard the same thing Ed, that this test will dull the edge. I don't buy it, from a logical perspective and from careful observation on my part. This test, done properly is the faintest of...

You can lightly draw the blade against your thumbnail edge, to feel for any chips. It is amazing how sensitive our senses are. Or you could do the Three finger test. Or you could buy a $10 60x Loupe...