When white light travels though a stone, one or more of wavelengths that produce color are absorbed Compact, pocket size makes it great for traveling with fixed slit & fixed focus. Length: 2.2 inch Bring it with you on buying trips, vacations, or to trade shows When white light travels though a stone, one or more of wavelengths that produce color are absorbed Made of aircraft aluminum and finest optics. UPC 717029486806 ASIN B00D49E8XE Color Black Brand Name Ade Advanced Optics Item Weight 9.07 g Manufacturer Ade Advanced Optics® Lens Material Glass Are Batteries Required No Manufacturer Part Number unknown