The Triplett RHT22 Temperature and Humidity Indicator simultaneously displays Humidity (10 to 99%RH) and Temperature (32 to 122°F / 0 to 50°C) on a large, easy-to-read LCD. Temperature readings are °F/°C switchable. Icons indicate comfortable, wet or dry humidity conditions. The Min/Max function with reset records the highest and lowest readings to monitor changing conditions over time. The RHT22 can be placed on a flat surface using its built-in stand or wall mounted in labs, green houses, cleanrooms, warehouses, museums, offices, schools, homes, and virtually anywhere indoor humidity and temperature have to be monitored. The RHT22 comes complete with one AAA battery.