Hardness is defined as a measure of how well materials resist localized deformation, such as impacts, indents, or scratches. Although it is a well-understood physical property, it is much more complex than other characteristics in that it is relative to different types of loading forces.

Essentially, hardness is only a measure of how well a material performs in a given hardness test. As a result, there are various hardness testing methods and techniques available to researchers today. In this article, we want to look into the four different methods of indentation hardness testing methods.