A professional mirror compass for precise directional measurements. The MC-2 D/L from Suunto features a sighting hole at the bottom of the mirror, making it easier to take a correct bearing. . 3.75 x 2.5 in. clear plastic base plate. 3-inch ruler measurement; also centimeter ruler. Grid lines at 1:24,000 and 1:62,500 scales. Rotating dial with 2 degree increments. Operates in temperatures down to -40 degrees fahrenheit. Self-cleaning capsule bearing. Liquid-filled for steady needle. Individually balanced tungsten steel needle. Adjustable declination correction scale. Easy-to-use extra-large luminous markings. Built-in magnifying lens with four-fold magnification. Adjustable nylon neck cord. Weighs 2.65 oz..