Graduation in miles for 1:24,000, 1:62,500, 1:250,000 scale U.S.G.S. maps and in kilometers for 1:25,000, 1:50,000, 1:100,000 scale maps allows ultimate precision and accuracy. Also provides inch and centimeter graduations for maps of other scales. Revolution counter, reset wheel and folding magnifier add even more precision. Includes vinyl storage pouch.