As defined in ISO 6508 & ASTM E-18, the Rockwell test is the most commonly used hardness test method. It is generally easier to perform, and quicker than other types of hardness testing methods.
The Rockwell method measures the permanent depth of indentation produced by a force/load on an indenter.
INNOVATEST NEXUS 610RS-RSB HARDNESS TESTER BROCHURE
INNOVATEST NEMESIS 6100RS IMP HARDNESS TESTER BROCHURE