It’s a thermometer! It’s a compass! It’s 2 inches long and weighs only 1/3 ounce. Snap this onto jacket zippers or backpacks. Use it as a key ring. The compass is liquid filled with luminous dial and there is a handy wind chill chart on the back of the gauge. Made in the U.S. Length 2″. Wt: 0.3 oz.