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I like to sharpen on hard stones, apparently. But there seem to be a few systems out there for judging hardness, and I have no idea how to convert between them.
JNS: Softish stones are 2.5, hardish ones are 4.5 to 5+, never seen a 6
Watanabe: softish stones are maybe 30-40, hard stones are in the 60s-70s
AFramesTokyo: hard stones are 8.something, softish stones are 7.something
So, three different systems. What are they? How do I convert one to another?
JNS: Softish stones are 2.5, hardish ones are 4.5 to 5+, never seen a 6
Watanabe: softish stones are maybe 30-40, hard stones are in the 60s-70s
AFramesTokyo: hard stones are 8.something, softish stones are 7.something
So, three different systems. What are they? How do I convert one to another?