What is Rockwell harding scale?

The Rockwell hardness scale is a method used to measure the hardness of materials, primarily metals, based on the depth of penetration of an indenter under a specific load. It employs various scales, designated by letters (like HRA, HRB, HRC), each using different indenters and loads to suit different materials. The hardness value is read directly from the scale, with higher numbers indicating harder materials. This scale is widely used in engineering and Metallurgy to assess material properties.