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The NIST SRM reference test blocks for the Rockwell C scale (HRC) are
certified at three hardness levels; 25 HRC, 45 HRC, and 63 HRC, (SRMs
2810, 2811, and 2812, respectively). Because these test blocks are often used
in situations where the highest measurement accuracy is desired, the first part
C.1 of this Annex provides recommendations for the proper use of the SRMs.
The second part C.2 of this Annex provides formulas for calculating the
certified value for any location on the SRM as well as the average hardness
of two or more arbitrary locations.
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