Gun Safe Dehumidifier, Moisture Absorbers for Storage, TOAAOT 200g Silica Gel Dryer, Aluminium Box Dehumidifier for Gun Box or Tool Box | 3 Pieces

They seem to be working fine. I'm using them for a 3D printer enclosure to try a dry things out a bit. Of course it depends on what you consider dry, but the best I've seen is 60% in a 3 sqft enclosure, with 2 of them in there. Granted I live in a very humid location near the ocean so you can only get so much. At first I didn't think they were working, but opening the lid showed me that the beads were turning green from the outside in. So the little window is reliable as a guage on when you need to recycle them. After about 5-6 days, I needed to recycle them. I had them in the oven a bit longer than I meant (about 4 hours instead of 3) but they seem to still working.

fits nicely in Handgun safe to keep moisture out

I've run these for a while now, they've really helped keep my safe's humidity down, I was at one point heating these up once every week, or two. Realized my issue was from the bathroom in the next room, added in a dehumidifier in that room, and now I only have to run these in the oven maybe once every 2 months. how ever while I was having to heat these up once a week or 2 weeks, they did really pull the moisture out of the safe, I saw no new rust build up after adding them in.

I've used these as a set it and forget it. They work well for smaller spaces and eliminate humidity without a larger machine.

Use these for all my dehumidifier needs. Very convenient and easy to use and they last for so long.