Excessive moisture in a vault or storage area can cause rapid corrosion on metal surfaces such as gun barrels and actions. Get accurate and easy-to-understand humidity readings with the Lockdown Hygrometer. The Lockdown Hygrometer mounts easily with included fastener or hook-and-loop tape, and displays readings in large, easy-to-see numbers.Manufacturer model #: 222111. Easy to install Large, easy-to-read numbers Includes mounting fastener