# KNOOP HARDNESS

The Knoop test allows measuring of the hardness of fragile materials such as glass and ceramics or deposits of low thickness.

The indenter consists of a pyramid-shaped diamond with a rectangular base. The first angle is 172°30′ between two opposite sides and 130° for the other two sides.

The applied loads are less than 1 kgf.

If the length and width of the indentation is measured using a microscope, the Knoop hardness (HK) is given by the following formula:
PRESI offers a range of Knoop Hardness Testers and accessories that facilitate hardness/micro-hardness testing. Our range is differentiated between the mechanical weight range (the Matzuzawa Microtech and Macrotech testers) and the load cell range (the HZ Hardness Testers).