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The total number of scales used in the Rockwell hardness test is?

To accommodate a wide range of materials with a wide range of strength, there are 15 different Rockwell test scales, each having a specified major load and indenter geometry.

The Rockwell hardness test uses 15 different scales, each with a specific major load and indenter geometry, to measure the hardness of materials. The Rockwell hardness test provides a quick and easy method for determining the hardness of a material, making it a widely used hardness testing method in many industries.