Monitor Humidity & Temperature Levels - help keep your gun safe moisture and rust-free by adding this SnapSafe Digital Hygrometer (75909) to your gun safes & cabinets to ensure that your dehumidifier is working optimally to help protect your firearms, gun accessories, ammo and valuables from rust and moisture Easy To Read Touchscreen Display - portable wireless hygrometer with a compact body and large LCD display that provides an accurate reading of the current conditions and even records high/low for both temperature and humidity in either Fahrenheit or Celsius Mounting Options - this mini hygrometer includes a fold-out stand for convenient storage on a shelf or on your safe’s floor. You can easily hang this digital hygrometer, indoor thermometer and humidity gauge onto vertical surfaces such as interior safe doors and walls for easy viewing All-Time/24 Hours Indicator - a temperature and humidity monitor that records and displays the minimum and maximum readings over a 24-hour period to help alert you to make adjustments appropriately for your safe’s needs. Powered by two AAA batteries (not included). Dimensions: 5.125 x 3.25 x 1 inches Gun Safe Accessories for Your Lifestyle - further protect and preserve your firearms as they are being stored with this efficient Hornady Safe hygrometer. Optimal for all of your small spaces including gun safes, workbench, gun locker, rifle safe, hard case, gun bag, closets, cabinets, cars, RVs, boats, and more