An American Classic - Since 1971, Zip-o-gage has been the most trusted personal zipperpull thermometer for the outdoors. A great addition to your key chain and can also serve as an awesome gift! Cushion-Mounted Thermometer - Our accurate thermometer reads down to a chilly -20° Fahrenheit or -30° Celsius. It's lightweight and small enough to take anywhere! Wind Chill Chart - Included on the back is a small wind chill chart that let's you calculate the "feels like" temperature. One of the essential tools for cold weather environments. Handy Keyring- Attach to your coat, pack, zipper, or anything else you can think of. The Zip-o-gage is the perfect addition to your camping, hiking, survival, and travel gear. An Outdoor Essential - Zip-o-gage is a must-have accessory for camping, hiking, backpacking, skiing, or travel. Great for an emergency, or just for every day carry (EDC). Since 1971, the Zip-o-gage has been the most trusted personal thermometer for the outdoors. Attaches to your coat, pack, keychain, or wherever else you need it. Reads down to -20º Fahrenheit and includes a wind chill chart. It's lightweight and small enough to take practically anywhere! The Zip-o-gage is the perfect addition to your camping, hiking, survival, and travel gear.