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Like Lester said, most makers don't have a hardness tester, most don't have scratchers like I do either. It isn't a matter of judgement btw. If my 57 scratcher doesn't scratch it it is harder than 57. If my 58.6 doesn't, but 60 does I know what part of the ballpark I'm in. Close to 59-60 and I can be confident what I tell my customer. 60 is where I like to make my knives, 59-61. These are not files really, but scratching points.
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