Which of the following is not a hardness testing method?

Which of the following is not a hardness testing method? Correct Answer Set method hardness

Hardness testing methods are processes to check the strength of the material. Rockwell hardness, Brinell hardness, Shore scleroscope hardness and Diamond pyramid hardness are typically used hardness tests. The set method is one of the methods used to determine the yield strength of a material.

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Grain hardness is measured by the __________ hardness testing method.