Hardness testers are instruments used to measure the hardness of materials, typically metals and alloys. They work by applying a specific force to an indenter, which then penetrates the material being tested. The depth or size of the indentation is measured and used to calculate the material's hardness. Common methods include Rockwell, Brinell, and Vickers, each with its own scale and units of measurement. These testers are crucial in quality control and material selection processes in various industries.
