Taylor 497 12" Outdoor Thermometer Temperature/Humidity Gauge Measure indoor temperatures or outdoor temperatures with humidity simultaneously with this thermometer/hygrometer. With all-metal construction, this gauge works well inside the home or on a patio or porch. Large digits and markings printed in bold black and red are easily visible from afar. Read temperatures from -60 to 120 degrees Fahrenheit (-50 to 50 degrees Celsius) and relative humidity levels from 20 to 90% with the dial's bright red pointers. Mount the thermometer/hygrometer indoors or outside with the built-in mounts on the rear.