The Macro hardness test is used for hardness testing larger samples in materials with a coarse or invhomogeneous grain structure. The Macro hardness test indentation leaves a relatively large impression, using a tungsten carbide ball. The size of the indent is read optically.

Micro hardness testing of materials allows for the determination of the hardness of small or thin specimens and small areas of larger specimens.  Micro hardness testing is commonly used to determine characteristics of thin sheets, foils, fine wire, epoxies, paints, etc.