Sun Co Zip-o-gage Thermometer Great For Any Outdoors Person. Use As A Zipper Pull, Key Ring Or Hang On A Backpack. The Thermometer Tube Is Sealed Inside A Clear Acrylic Case With A Handy Wind Chill Chart On The Back. Fahrenheit/celsius Temperature Scale. Range -20 To +120 Degrees F And -30 To +50 Degrees C. Dimensions: 1 1/8"x 2". Wt: 0.3 Oz.