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The magnitude of change in the Rockwell hardness value that results from
a change in the applied force is shown in Figure A.1 for the preliminary force
and in Figure A.2 for the total force. The test method standards published
by ASTM and ISO provide tolerances for the applied Rockwell forces.
Summaries of these tolerances are given in Table A.1. Figure A.3 illustrates
the possible variation in Rockwell hardness measurement values that can be
obtained for the diamond indenter scales while maintaining the forces within
the specified tolerances
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