Knoop hardness
rombikujulise püramiidindentori (laiuse pikkuse suhe 7:1) katsetavasse materjali sisse surumise teel määratav kõvadus, measure of the hardness of a material, calculated by measuring the indentation produced by a diamond tip that is pressed onto the surface of a sample, term "microhardness" has been widely employed in the literature to describe the hardness testing of materials with low applied loads
