CAMTOA Professional Multifunction Military Army Metal Sighting Compass High Accuracy Waterproof Compass Metal American military Compass Compass face diameter: 2-1/8 1/4-inch sighting lens & sighting lines on cover Entire compass measures 3-1/4 x 2-1/2 (inches) Waterproof and shakeproof This compass with luminous display inside, convenient night clearly viewing