EXMAX Blue Indicating Silica Gel Beads(2-4mm) Desiccant Functional Hard Plastic Canister Dehumidifier Moisture Absorb Box Dryer for Camera Microscopes Telescopes - 2 Pack

Works fine, keeping my 3D printer filament dry and safe. I place opened rolls of filament in either vacuum bags or ziplock bags with one of these packs and they have performed fine. I've had to reactivate one pack after it dealt with a ripped ziplock a couple times, no issues following the microwave instructions to dry out the pack. Changed back to blue, placed it back in a new bag with a few rolls of filament and everything has been great, no moisture issues at all. If there's anything negative to say about this product it could only be the price but you get a decent amount in 2 cases so I do feel you get a good value. There are larger containers of this product type but you need to use or get your own smaller containers for use.

I put a box of these in my storage box for superglue in my non-climate-controlled workshop (humidity is one of the killers of superglue). The blue turned to purple, so I microwaved the box, and it came back to blue. I had a temperature/humidity/clock, which I put in my storage box--it dropped the humidity in the box from 45% to 20%, so these desiccant beads definitely work, and they are reusable (at least, once).

It works well at work for keeping our waffle cones from becoming soft on humid days when we store them at night.You have to watch it closely when recharging them in the microwave or the case will melt.Next time I will buy the silica beads in bulk and use my own container.

I put these in my soap curing closet and they work very well to draw the moisture from the air. It's been very humid here in Western Kentucky so they've had to work extra hard and I have to zap them in the microwave about every other day, but it only takes a few seconds. My only complaint is that they are extremely easy to pop open when dropped. Ok, so I shouldn't go around dropping them, but it can happen and it totally did. The box popped right open and two and a half million silica gel beads scattered across the dining room. It took over an hour to get them all swept up (partly because my new kitten thought it was a game and kept running and sliding through the pile I'd swept up) and I still occasionally find one. So, they work great (in a relatively small space like a closet) and are easy to refresh in the microwave. Just be sure to not drop them or you can do what I did and glue it shut. I used two-part epoxy.

These work really well for keeping moisture away from my 3D printer filament. I keep them in a sealed plastic box with two of these gel packs inside. I live in a high humidity area during the summer, usually 80% - 95% all summer long. The gel packs had turned red by the end of the summer. I nuked them both in the microwave at the lowest power setting for three minutes while I watched them. They were hot and steaming! They are blue again and ready for reuse. However, I would warn anyone to be careful microwaving these. Even the lowest setting on many microwaves is too high and will melt the plastic if you put them in for the suggested 5 minutes. You must take caution and try microwaving in short intervals to see if it gets too hot. You may have to spend a lot of time turning the microwave on and off to prevent the case from getting too hot. But spending 10 minutes heating these once every 3 months is worth it. I will be purchasing more.

These are tiny. Needed “recharging” in less than a day in our safe. During “recharging” the plastic housings came apart. Mess ensued in Microwave...(Wife not amused.)

I bought these because I just purchased an expensive microscope. I had to purchase a new microscope, because the humid climate I live in, ruined my last one. I got these and put them all around the new microscope in it's case to keep the humidity and moisture out. I would recommend these to use in storing any equipment, even electrical equipment to preserve them. Don't let happen to your expensive items, that happened to mine. It was a very expensive lesson, for something that would have been very cheap and easy to use, that I just didn't think about. With this new microscope, I made sure that will not happen again. I highly recommend these, and gave them a 5 star rating.

I would not buy this again.The first time I reactivated them I dropped one and the tape had weakened so it popped open and all the beads came out. My fault, I shouldn't have been trying to carry so much at once.But the second time I reactivated the remaining one it warped in the microwave and when I took it out it just opened up and spilled everywhere. This was following the manufacturer's instructions, 5 minutes at medium/low power.I'll stick with the ones you leave in the oven for hours.