A compass and thermometer in one. Our Tag-Along™ compass, the 9045 is a keyring compass with five-degree graduations on a small baseplate. You get a thermometer and even a windchill chart that goes where your keys do. 2.5"x1.8"x.44" .7 oz. 5° graduations Brass split ring Thermometer Windchill chart on back in °C & °F