A hand grinder is a manual device used for grinding coffee beans or other materials. It typically consists of a handle attached to a cylindrical grinding chamber, which contains a set of burrs or blades that crush and grind the beans into a consistent texture. Hand grinders are a popular choice among coffee enthusiasts who value the ability to control the grind size and enjoy the ritual of manual coffee preparation. They are also portable and can be used in settings where electricity is not available.