A Webster hardness tester is a portable device used to measure the hardness of aluminum, brass, copper metals. It is specifically designed for quick and non-destructive hardness testing. The tester consists of a spring-loaded impact body with a spherical indenter. When placed on the surface of the material, the impact body is released, causing the indenter to penetrate the material. The depth of penetration is then measured, and the hardness value is determined using a conversion chart specific to the material being tested. Webster hardness testers are commonly used in industries such as metal fabrication, construction, and quality control to assess the hardness of materials on-site.