4-pack Mini Hygrometer Thermometer Fahrenheit Indoor Room Round Humidity Temperature Gauge for 3D Printer Home Jars Reptile Incubator Guitar Case

Like most people, as soon as I opened the box I put all 4 side by side, and sure enough the readings were very close. I took one of these out on our morning walk today and was very impressed by the speed of response on the humidity readout. As we walked up a hill the humidity went up from 72% to about 82%, which made sense as it was a bit Misty. When we walked into a building it immediately dropped to 65%, and it dropped to 45% when we put the a/c on in the car. The temperature display seems a bit slower to respond, but I was very impressed. These are nice and small to stick to the wall in different rooms, but the readout is easy to see. A good deal.

I am a professional musician in a house full of musical instruments. This 4 pack was perfect for monitoring the humidity in all the rooms where violins/violas/cellos live. You can even put one in the case. They seem accurate enough for every day use and were inexpensive.

All of the hygrometers in this general price range tend to use the same internal sensor - they have a 'floor' of 10% and won't read any lower, and occasionally get 'stuck' in their reading - which can be addressed usually by breathing on the sensor. Meanwhile, they fit perfectly into the 'fast print spool dessicant holder' from printables, which I literally have dozens of for my vac-sealed filament storage. I do wish you could buy them in larger quantities like 8 or 10 packs, but for ~$3 each, they're pretty decent.

I must have 25 of these. I use them inside plastic cereal boxes to monitor moisture inside where I store 3d printing filament. I have a whole wall of cereal containers that each contain a spool of various colors.

It was super helpful for our house as I felt like there was too much humidity in the house and it did in fact prove that we had humidity leaking in from outside making surfaces in the house sticky. It allowed us to solve the problem in our house.

These are cheap, and the temperature readings seem reasonably accurate. I think the humidity readings are okay for moderate to high values. But they're very inaccurate on the low end. None of the ones I've bought will read below 17% even if they're in a sealed, dry container full of silica desiccant beads. Physically, they're not super sturdy, but they're good enough. None of mine have fallen completely apart, but I've had a few whose cases started to come apart when I've pressed them into a 1 5/8" hole. I was able to press them back together just fine, and the clips have held them into the holes so far. Even with those problems, I'll continue to buy more to use in my 3d printer filament dry boxes. I just have to remember that a reading of 17-18% means "really dry", which is good enough for my purposes. I don't need the extra accuracy I'd get from a more expensive hygrometer.

I don’t know how accurate these are but they do work. Humidity was reading at 40% when I installed these in my machine. After adding desiccant, it dropped to 10% so they do work in helping me to monitor when I need to change the desiccant.

These thermometers & hygrometers work well enough for most uses, realizing that they will only go down to 10% humidity. For drying 3D printer filament, this is good enough. If you set the four units down on a surface and come back in an hour or two, the temperature readings may very by a degree or two. Again, good enough for most uses. But if you are expecting precision instruments, these are not them. Good value for the money.

Werden klassisch in einem AMS Hydrosystem genutzt. Funktionieren tadellos!

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Not worth buying… straight out of the box only 3 worked and using those 3, I now have 3 different temperature readings and three different humidity readings…

Ottimo per umidor

Received today in Ontario - winter time. Came with fresh batteries and all indicated the same as I brought them in the house from the mailbox - outside temperature and humidity. In less than an hour they indicated the temperature and humidity as my central unit thermostat. Great product, all 4 indicate the same: humidity is 40% on 2 pills and 41% on the other 2. Temperature on the 4 pills indicates between 22.2-22.7 Celsius. Fast shipping, quick answers from the seller. THANK YOU Seller! It solves my problem of knowing the humidity in different rooms in the house.