Taylor Precision Products Digital Indoor/Outdoor Thermometer/Hygrometer Measure indoor temperatures with humidity and outdoor temperatures simultaneously with this thermometer/hygrometer. Place the 10-foot probe outside to keep track of outdoor temperatures from -58 to 158 degrees Fahrenheit (-50 to 70 degrees Celsius). Easily read temperatures from 14 to 122 degrees Fahrenheit (-10 to 50 degrees Celsius) and relative humidity levels from 20 to 99% indoors on the backlit display, switching between scales with the push of a button. Mount the digital thermometer with the built-in keyhole mount or use the table stand to stand it upright on a flat surface. Press the Min/Max button located on the back of the unit to view minimum and maximum records.