Portable & Durable Silica Gel Tin Canister Dimension: each tin canister is 5.16 inch x 5.16 inch x 0.79 inch. By utilizing high-quality aluminum constructs, the indicating silica gel reusable dehumidifier is firm and sturdier to prevent dents. Independent small portable silica gel tin canister is convenient for you to use and store. Indicating silica gel beads: Cobalt chloride-free orange indicating beads will change color to green when they become saturated with moisture. Each orange indicating bead is 2-4mm in size and will begin to change to different colors at 20%-50%RH. When you find the beads begin to change color, it does not mean the beads saturated with moisture and the beads will continue to absorb the moisture until 50%RH. You can check the instruction to measure the humidity and moisture. Transparent Window & Easy To Reactivate: Look through the transparent window, if the silica gel turns from orange to green, it means the environmental relative humidity is greater than 50%. The reusable indicating silica gel canister desiccant dehumidifier can be reactivated by placing into the oven for 3 hours at 250F. Depending on silica gel beads condition, they may take shorter than the recommended time. Please check the silica gel beads color. Great Absorbing Capacity & Multi-Purpose: Silica gel can protect up to 120 cubic inch each one grams of any enclosed or sealed storage space such as safe, ammo cans, ammo boxes, tool box, 3d printer filament sealed plastic storage box, weapon case, closet. Provide a better solution to keep moisture from guns, important papers, legal papers, collectibles, books, jewelry, photo album, shoes, camera lens, expensive camera equipment, toys, leather clothing, ammo, photo equipment.