A portable Lee hardness tester is a handheld device used to measure the hardness of a material. It is designed for on-site or field use, providing quick and accurate hardness readings without the need for laboratory testing. The tester works by applying a known force with a diamond-tipped indenter onto the material’s surface, creating an indentation. The depth of the indentation is then measured, and the hardness value is determined based on the indentation size. Portable Lee hardness testers are commonly used in industries such as manufacturing, construction, and automotive for quality control, material selection, and maintenance purposes.