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Jimmy~ I'm having that distal baldness problem :D Starting to prefer the SAHT (single arm hair test) :)

You can use different tests in early stages. Even a visual is good. For me an even scratch pattern all the way to the edge often signals a change up. I use a loupe a lot, others go with the more...

What's more important is to take one of those pro honed razors & see "how" it cuts arm hair. That is then your benchmark. Try slow & gentle .
How you test at earlier stages is subjective &...