<P> Common indentation hardness scales are Rockwell, Vickers, Shore, and Brinell . </P> <P> Rebound hardness, also known as dynamic hardness, measures the height of the "bounce" of a diamond - tipped hammer dropped from a fixed height onto a material . This type of hardness is related to elasticity . The device used to take this measurement is known as a scleroscope . </P> <P> Two scales that measures rebound hardness are the Leeb rebound hardness test and Bennett hardness scale . </P> <P> There are five hardening processes: Hall - Petch strengthening, work hardening, solid solution strengthening, precipitation hardening, and martensitic transformation . </P>

What is a good way to compare the hardness of two materials