LUMINOUS COMPASS - Easy-to-read luminous compass keeps you on course, even in low-light conditions. THERMOMETER - Thermometer reads down to a chilly -20 F or -30 C WINDCHILL CHART - View the simple windchill chart on the back of Therm-o-Compass to determine the "feels like" temperature. Perfect compliment for camping and hiking gear. SPLIT RING - Solid brass split ring lets you easily attach Therm-o-Compass to your zipper or serve as a keychain. The perfect zipper pull for your jacket, parka, or backpack.