Material testing -- Mechanics -- Standardizing Hardness Tester
			Standardizing Hardness Tester   - The forces are generated by dead weigt loading under consideration of the drive-up of the air, the local gravity, an the fact that the ration between the smallest and the biggest force does not surmount 1:1.5; - The measuring of the depth of indention will be executed according to the principle of ABBE and consequently errors of the first rank are excluded; - The execution of the test procedure is time controlled and reproduceable (with restrictions when executed by hand control); - The measuring of the indentations in the test surface is executed by special microscopes; and - The table for mounting the hardness standardizing test blocks must not be adjustible with respect height for avoiding spindle-lead. The vast range of forces and the variety of the different test prcedures when measuring according to Brinell, Rockwell, and Vickers require test machines, which can be used for a limited part of the total measuring range only.