Accuracy, repeatability, and correlation issues with Universal Vickers / Knoop, Rockwell and Brinell Hardness testing may often be divided into three categories and linked to five fundamental causes: the machine, the operator, and the environment, sample preparation, and calibration. It’s crucial to clarify the issues before talking about the causes:

Accuracy: The instrument’s capacity to read linearly on certified test blocks, which are accepted hardness standards, and its capacity to transfer this accuracy to test specimens.

Repeatability: The instrument’s capacity to reproduce its findings when applied to accepted hardness standards.

Correlation: The ability of an instrument to generate results that are comparable to those obtained by another instrument that has been “fully calibrated”; or the capacity of two operators to measure the same impression with the same equipment and produce comparable findings.

The force error of our Universal Hardness Tester for Vickers / Knoop, Rockwell, and Brinell is just ＜0.5%.

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