JIS B 7730:2017 specifies a method for calibration of reference blocks of scales A to H, K, N, and T, to be used for the indirect verification and daily checks and maintenance of Rockwell hardness testing machines specified in JIS B 7726 (hereafter referred to as reference blocks).
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JIS B 7730:2017
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Rockwell hardness test — Calibration of reference blocks
Japanese Industrial Standard / Japanese Standards Association , 01/01/2017