The Carson Multi-Power Magnifier 5-15x30mm is a universal folding loupe. It consists of three separate magnifying glasses, each magnifying glass having a 5x magnification. By unfolding the lenses you can enlarge 5x, 10x and 15x. The magnifiers have single lenses and a diameter of 30mm. This magnifying glass is known as a jeweler's loupe, as this type of magnifying glass is often used for observations of jewelry.