The worlds #1 Military Compass by Cammenga. Built to the demanding specifications of U.S. fighting forces. Features advanced tritium micro lights that stay luminous for over ten years without batteries! Induction dampening means no liquid, no bubbles, and no leaking! Battle tested - shock, water, and sand proof. Functional from -50ºf to +150ºf. The CAMMENGA 3H Compass is depended on by the U.S. Military as well as the most extreme outdoor enthusiasts all over the world. The accuracy and quality of a Cammenga Compass saves time and saves lives. Proudly built in the USA.