Hardness testing with mobile hardness gauges (King Brinell, Equotip, Poldi)
Vickers, Rockwell and Brinell methods.

Static hardness testing on a bench using Rockwell and Brinell methods.

Hardness tests can provide useful information about metallic materials.
This information may correlate to tensile strength, wear resistance, ductility, or other physical characteristics of metallic materials, and may be useful in quality control and selection of materials.