The difference in one unit of Rockwell hardness number corresponds to a difference in the depth of indentation of ______________ mm ?

The difference in one unit of Rockwell hardness number corresponds to

1.	The difference in one unit of Rockwell hardness number corresponds to a difference in the depth of indentation of ______________ mm ?
A.	0.001
B.	0.01
C.	0.002
D.	0.02
Answer» D. 0.02

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The difference in one unit of Rockwell hardness number corresponds to a difference in the depth of indentation of ______________ mm ?

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