ToolUSA Maximize 40x Led Illuminated Jeweler's Loupe: MG-12230 Illuminated with 2 very bright LED lights to exactly find blemishes Powerful 40x power magnification for 400% larger viewing of detailed objects 25 mm diameter quality lens; ideal for jeweler's performing appraisals, watchmakers, etc. Batteries already included - 3 LR927; easily replaceable by opening battery compartment Frame of loupe is made of plastic and body is made of durable aluminum