Serundo Auto Digital Hygrometer Thermometer Room Indoor Thermometer 4 Pack

This is a great little thermometer, especially for the price. I’ve had mine for quite a while now and keep it mounted near my door. Since I have a mini-split AC and heating system, it’s really convenient to be able to see the temperature across the room without relying only on the unit itself. It also displays the humidity, which is a nice bonus and helps me keep an eye on the overall comfort of the room. Simple, useful, and very affordable. It has worked well for me and does exactly what I bought it to do.

These little hygrometers are perfect for my 3D printing setup. I use them inside my AMS/dry boxes to keep an eye on humidity and make sure my filament is staying dry. They’re small, easy to read, and simple to place wherever you need them. For the price, it’s a really good way to monitor humidity without overcomplicating the setup. I like being able to quickly check if my filament storage is staying where it should be, especially for materials that are more sensitive to moisture. They are small meters, so I wouldn’t expect lab-level precision, but for everyday monitoring they do exactly what I need. Great value if you use filament dryers, storage boxes, camera gear storage, cabinets, or anywhere you want to track humidity and temperature.

Arrived on time (which more due to Amazon and the carrier, I guess). These little guys both work, appear to be accurate, and not only were the batteries installed, there were 2 spare batteries as well. I mean, who does that any more? This was a completely positive experience, and I would recommend these thermometers over the others of the same size/type.

These things work pretty well. I bought two, one to sit inside my AMS and one to sit outside, so i could compare the AMS internal properties to the room properties. The two devices seem to be pretty consistent in their readings. I did however notice that the AMS reports a higher humidity than this meter does. The devices arrived with batteries in them, but unlike other products that have batteries pre-installed, these didn't have a pull tab to break the circuit until use, so the batteries are somewhat depleted (i presume, based on the dimness of the displays). No biggie though - they accounted for this and included extra batteries (i haven't installed them yet though). I plan to buy a few more of these and put them into my filament storage cases.

Bought these for our 3D printer after finding a file that recommended this one. The numbers are super easy to read and straight forward. You can tell at a glance a temp and how wet or dry your filament is. It’s made our prints way more successful

I picked up this 6-pack to monitor overflow cigars that I keep temporarily stored in airtight Tupperware containers. I tend to buy cigars in larger quantities, so sometimes they sit before I make room in my humidors. These little hygrometers are perfect for that purpose. They’re small, easy to tuck inside containers, and give me a quick snapshot of temperature and humidity. They’re not lab-grade precision, but they’re close enough to keep an eye on things and make sure nothing is drifting too far. For the price, getting six of them is a no-brainer. If you need simple, affordable monitoring for secondary storage, these do the job.

I have bought 6 of these total and all are within 1 degree & 1% difference to each other. Also very consistent in unison with my thermostat. Comes with batteries installed as well as extras. The mounting discs are fairly sticky and holds well. All in all, pretty good for the price.

I bought these to use in my incubator to double check the humidity and temp. I’m glad I did because my incubator gauge was way off on both. I did the humidity salt test as soon as I opened these and they were both shy by 4%. (In a sealed bag with damp salt they should read 75% after 12 hours.) They have still been useful, I just have to lower their numbers by 4 in my head. The temperature I don’t really have an easy way to fact check but it did match my wall thermostat more or less. They did not agree with each other entirely, however. If you purchase these as a cheap solution I highly recommend you salt test them first and somehow verify the temp. If I could go back in time I would not have purchased these for incubating eggs as you have to be highly precise and accuracy matters.

They’re very helpful, I use it in my jumping spider terrarium.