Sometimes, gauging the strength of materials through Rockwell Hardness Tester is preferable. This is due to a number of advantages.
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The sample material for several tests needs to be polished, ground, broken up, and buffed to obtain the most accurate readings. In essence, tests like the Knoop and Vickers method require that the sample surface be as flat and variable-free as feasible.
Since the Rockwell method measures the indentation depth, the sample does not need to go through further processing for the test to be accurate. This is also why unprocessed commodities like ore are tested using the Rockwell method.
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Since most hardness testers that employ the Rockwell method don't use diagonal scales to measure hardness, the hardness value is easily readable. This is definitely the case if you use a digital Rockwell Hardness tester, as the results are shown on the screen right away after a little processing period.
The lack of visual examination significantly decreases the likelihood of an operator reading error.
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