The 60mm (2-3/8") diameter magnifier is best for a broad range of close-in detail viewing of jewelry, coins and miniature models. It comes with a felt-padded lens case. Zeiss Multilayer Anti-Reflective Coating is highly recommended to eliminate the distracting glare of sun or room lighting which can bounce off of uncoated glass surfaces and make viewing difficult. Coated lenses are a must for long periods of detail viewing, especially when you must work outdoors or under fluorescent ceiling fixtures or other uncontrollable lighting.