This inexpensive full-function Mirror Sighting Compass is perfect for the mountaineer, hiker, backpacker, or boater. The compass features a fast and accurate needle, rotating bezel with 2 degree graduations, 1/20-inch scale and millimeter rules. It is extremely versatile with a high quality glass (not plastic) mirror for additional accuracy and ease in finding the correct bearing. The unique dual hemisphere balanced compass needle is accurate in both Northern and Southern Hemispheres. The Mirror Sighting Compass is perfect for land and sea navigation where fast and accurate sightings are needed. Fold the secure snap to close the lid and the compass measures only 2 3/8 inches (6.0 cm) wide, 2 5/8 inches (6.7 cm) long, 5/8 inch (1.6 cm) thick, and weighs just 1 1/2 ounces (43 grams).