The Golden Rod Digital Wireless Hygrometer is a great way to keep track of the humidity levels in your gun vault without even opening it. This system uses a wireless LCD display that will show the in-vault as well as the in-room humidity and temperature levels. Place the wireless display screen on the outside of your safe using the magnet or the built-in kick stand and place the sensor in your vault. Prevent rust before it has a chance to start and place this easy to use system by Golden Rod in your vault today.