Loupe
A loupe (pronounced loop) is a small magnifying glass, typically used for examining objects with detail. It can be handheld or attached to a stand, and it's commonly used by photographers, jewelers, watchmakers, collectors, and scientists. Loupes are also popular as a decorative accessory. Loupes come in different magnifications, usually ranging from 2x to 10x, and the size of the lens can vary as well.