This high quality large aperture magnifying Loupe is ideal for Jewellers, rock hounds, Currency inspection, medical, biology, electronics, stamps, coins, industrial inspection, household magnification and many more uses. This is our most popular Loupe with the ease of use that comes with a larger lens and powerful illumination. The UV light in particular will often show fluorescent minerals in rock samples that would otherwise be invisible Specifications: Aperture: 25mm Magnification: Rated 40x (practical 15x) illumination: LED/UV Construction: Chrome Steel Batteries: Included 3xLR1130