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The Rockwell hardness test is the most used and versatile of the hardness tests. For soft materials such as copper alloys, soft steel, and aluminum alloys a 1/16 diameter steel ball is used with a 100-kilogram load and the hardness is read on the B scale.
The three scales overlap and that's where the Rockwell measuring system can be quite misleading. The A scale overlaps the B scale and the B overlaps the C. So a high RA (read: Rockwell A value) can mean the same hardness as a low RB and a high RB can mean the same as a low RC. Some people who don't like this tend to prefer the Brinell Hardness scale which is significantly more simple to use.