GrowBright Digital LCD Humidity Monitor & Indoor/Outdoor Thermometer Provides accurate readings of indoor temperature and humidity, and outdoor temperature Humidity range: 25%RH to 90%RH ; Temperature ranges: (Indoor 14F ~ 122F / -10C ~ 50C) (Outdoor -58F ~ 158F / -50~ 70C) Includes 6' remote probe (reads outdoor temperature) Features min/max temperature and humidity memory and freeze-alert function Measures: 4-1/2" long x 3-7/8" wide x 3/4" thick ; Operates on one AAA battery (Included)