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I purchased a pack of colour changing silica gel beads online. They change from blue to pink when they have absorbed moisture. You spread them out on a tray in the oven, set at 120 degrees for an hour or two, and they recharge back to blue. I have a pair of Nikon aculon binoculars ( not water proof) in a sealed clip down plastic food container with the beads on a small tray. I have two aluminium silica gel canisters coming soon, and will use them in the eyepiece and the binocular boxes.
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