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It's $10 and throw it in a sealable tote with all your pellets. When the meter turns from orange (dry) to green (wet) flip out the hinged plug, plug in a 120v recepticle for 12 hours till orange and put it back in the tote for a month till green. I put one in my vehicle during winter months to absorb snow melt humidity must smells, gun safes, closets, small areas etc. Indoor a/c is 50% RH. Tote is 20% RH.