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That is also one of the primary tests that I use. :-)

I just spent some time reading the article about the HHT numbers.

Calibrate, in the context of the numbers means to know for your hair which number it is off of each stone in a honing progression....

For those that are still worrying about this, here's something that might help:

I put together a warning awhile ago, just never got around to putting it in the wiki:

92077



Is that clear enough?

The only way the HHT will ever be meaningful for you is if you do it on a lot of razors of varying sharpness to see how YOUR hair reacts to different edges.
Your hair might be a HHT-3 on a blade and...