The Hornady Digital Hygrometer displays high/low for temperature and humidity in Fahrenheit or Celsius on large touchscreen display. Install quick-connect bracket on interior door or wall of safe or vault room, or use fold-out stand. FeaturesIndoor thermometer and humidity sensor for safes and vault roomsDisplays high/low for both temperature and humidity in either Fahrenheit or CelsiusLarge touchscreen displayInstall the quick-connect bracket on interior door or wall to save shelf space and allow easy viewing and retrievalIncludes fold-out stand for convenient storage on shelf or floor of safePowered by two AAA batteries (not included)