The SnapSafe Digital Hygrometer ensures the best environment for guns, accessories and other valuables with the SnapSafe Hygrometer. Placed inside a safe or vault room, the hygrometer displays the current temperature and humidity level as well as recent extremes in either Fahrenheit or Celsius. Large LCD display shows icons indicating air conditions and fold-out stand allows for convenient storage on shelf or floor of safe. Unit is powered by two AAA batteries (not included). The SnapSafe Digital Hygrometer retains extremes in humidity and temperature until manually erased or batteries need changed.