Hornady Digital Hygrometer - The Hornady Digital Hygrometer displays high/low for temperature and humidity in Fahrenheit or Celsius on a large touchscreen display. For mounting, install the quick-connect bracket on the interior door or wall of safe or vault room. Also includes a fold-out stand for convenient storage on a shelf or floor of your safe. Indoor Thermometer And Humidity Sensor For Safes And Vault Rooms Powered By 2 AAA Batteries (Not Included) Large Touchscreen Display