The distance between two blades is read from a scale connected to an eyepiece. The read number is called the optical number and with each testing device there are tables to convert the optical number ...

The hardness of Fine Ceramics is typically measured using the Vickers hardness scale. Alumina ceramics, a type of Fine Ceramic, are a very hard material–approximately three times harder than ...

the Rockwell hardness test, and the Vickers hardness test. The Rockwell hardness test is the most widely used technique, easy to carry out and more precise than other kinds of evaluations. The Brinell ...