loupe

A loupe is a small, portable magnification device consisting of a single convex lens or a short focal-length optical system that is used to inspect small details at close range. Loupes are held close to the eye and are distinguished from larger magnifying glasses by higher magnification and compact form, typically ranging from about 3x to 20x.

Common forms include unscrewed pocket loupes with a fixed lens, folding loupes with a hinged lens, and larger head- or helmet-mounted models. Magnification commonly used in jewelry and gemology is 3x–10x; higher-power loupes for watchmaking, electronics, or dental use can reach 15x–20x. Some models include built-in illumination and a stand for steadier inspection.

Uses of the loupe span several fields. In jewelry and gemology, loupes help assess cut, clarity, and color. In watchmaking, they are used to inspect gears and finishing. In electronics and manufacturing, loupes aid in examining solder joints and small components. In art restoration, philately, and numismatics, loupes enable study of micro-details. In dentistry, dental loupes provide magnification during procedures and assist in precision work.

Origin and terminology: The term loupe comes from the French word for magnifier. Loupes offer a portable alternative to microscopes and are not intended for viewing at very high magnification or for examining living organisms. They are commonly used where detailed close-up inspection is required and portability is important.