ALVIN® 2-Face Map, Plan or CUrve Measure - Bright nickel plated finish with convenient handle and clear unbreakable plastic lenses. For measuring distances on roads, and curves, contours, etc., on maps, patterns and drawings. Dial registers inches, half-inches, and centimeters up to 39" and 99cm. Also measures statute miles and nautical miles. (Multiply for feet, yards or miles).