Sun Co TempaComp Carabiner
From Sun Co:
"TempaComp has a thermometer and compass, all on one handy carabiner. Easily attach it to your pack, jacket, keychain, or wherever you might need it. From hiking and camping gear to backpacking and climbing, the TempaComp is the perfect accessory for your adventure. Just clip and go! The ball compass is readable at any angle and displays both cardinal points and direction of travel. Thermometer reads down to -20º Fahrenheit (-30º Celsius). Not for load-bearing use.
NOTE: Do not use the side card for general orientation purposes. Doing so will cause readings to be off by 180°."