The La Crosse Technology® Indoor Temperature and Humidity Gauge is a dual-gauge indoor thermometer that measures temperatures from -10°F to 130°F (-20°C to 50°C, and humidity from 10%–100% relative humidity. Humidity plays a big role in comfort, so the La Crosse gauge monitors 5 levels of indoor comfort: Dry, comfortable/dry, ideal, comfortable/wet, and wet. The La Crosse Indoor Temperature and Humidity Gauge can be used on the wall or placed wherever you need to monitor indoor conditions. Batteries not required. 6.30"L x 1"W x 3.18"H. Manufacturer model #: 104-288. Measures temperatures in degrees Fahrenheit or Celsius. Temperatures range from -10°F–130°F (-20°C–50°C) Measures 10%–100% Comfort scale rankings: Dry, comfortable/dry, ideal, comfortable/wet, and wet. Wall-hanging or free-standing.