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There are a number of testing standards and units such as the Brinnell scale, the Rockwell scale and Leeb rebound hardness level, for example to measure the foam hardness or soft plastics Shore A and Shore S are used.
The hardness profile along the bar is then determined by hardness testing to either the Vickers or, more usually, the Rockwell scale.
After the Friction Forging treatment, the spine of the knife blade will measure in the mid-40s on the Rockwell C scale, while the cutting edge will measure in the area of 65 to 68 C on the Rockwell scale. For those unfamiliar with the Rockwell hardness tester, 65 to 68 C is very, very hard indeed.