6-Pack Mini Hygrometer Indoor Humidity Meter Digital Thermometer | Small Temperature and Humidity Monitor (℉) for terrarium, Reptile Thermostat, Incubator, Fast Refresh Humidity Sensor

I'll jump in with the pros and the cons. There will be some overlap. Pros: - A cost effective solution for knowing the temperature and humidity level. Considering you get six of these guys, it's an amazing buy. - Small and compact measuring approximately 1.875 by 1.25 inches. Numbers are easy to read with the humidity number being displayed most prominently. - Fairly accurate. Measuring them against each other on my desktop, all read between 68.7 and 69.4 degrees F with humidity registering 36-38 percent with one showing 36, three displaying 37 and two showing 38. I'd note I do have a small heater running at one end of my desk, so this to me falls into the fairly accurate for the price category. Cons: - No way to calibrate. - These were designed to clip into something, though I don't know what. There are clips on the sides of the units. - While they are free standing, there is no way to set them at an angle. - They do feel pretty cheap, so durability and battery life are questions I can't currently address. Recommendation? Yes, I think I would recommend them for simple, basic information. I intend to put a few of them into my seed starter trays to keep an eye on humidity and temperature when I start my plants, so who knows how they'll do in that warm, humid environment. But I'd order them again given my overall first impressions.

Why did you pick this product vs others?: A few months ago we bought a small 3D printer, but along with a printer you have to buy filament, and figure out a way to store it. Then there's the issue of moisture - too much and your 3D prints won't turn out well. I found these small hygrometers which work perfectly to put 1 in a bag or container with every roll of filament, to keep an eye on the humidity levels. These hygrometers may not be precise enough for scientific use, but for home uses they're fairly accurate and small, so they work great for our purpose. When they first arrived, we set them all on a table next to each other for about a day, to see if they all measured the same temp and humidity, there are slight variations but they all measured fairly close to the same so they seem accurate enough for our purposes. If I end up with any extras, I plan to also keep one at my desk at work since it's such a small item that takes up almost no space.

Hygrometer is accurate but the temperature is way off. All the ones in the pack showed different temperatures but same humidity rating. They all come with batteries and already turned on curiously… Overall filled my use for them, temperature reading wasn’t as critical for me.

I recently picked up this 6-pack to manage humidity levels across different environments in my home, specifically for my instrument storage and a few sensitive closets. After using them for a week, I've found them to be an exceptional value for those who prioritize broad coverage over high-precision laboratory standards.

I have bought these twice now for a couple of projects I had for 3D printing area. They fit perfectly in the models that I printed with them in mind and do appear to last quite a while. They also appear to be fairly accurate in reading the temp and humidity in the area. Definitely helped me realize that I needed to buy a dehumidifier for my office! :)

placed the set of 6 in a group facing the same way to expose the sensor consistently. Placed a couple other sensors that I trust next to the set of 6 .. again, exposing the sensor the same way. Left them overnight so they would stabilize. The temp reading were within 0.5 degree of my trusted reference. The humidity reading were off by 3-4 percentage points, reading higher than my reference. 2 units had the same reading, while the other 4 were different. As other reviewers ave mentioned, they do come in an 'On' state, so you really have no idea how long the batteries have been running. Time will tell how long the batteries or the units last. A little irksome, made me go 'huh .. why?'. A pack of 12 batteries will probably cost close to the same as a new set of 6 sensors. So ... :-) , Bottom line: they work for general use as long as you are not trying to be accurate to the degree or percentage point. These will be OK for my use as I don't need an exact reading, a ballpark number is good enough for me. Edit after a day's use: Saw this today on my test set. Again .. temp is ok. Humidity .. a big letdown. Sorry, but these are going back.

Usability: Arrived working right out of the box. Dimple LCD Screen that's easy to read. Operation: just place it somewhere and that's it. It updates every 10 seconds or so until equilibrating. Size: very convenient size you can put pretty much anywhere without being noticed. From your window sills, in your car, bathroom, anywhere indoors. Consistency: I haven't noticed any outliers from my batch. They're all Consistent but if course will vary if you have them set in different rooms. Overall Results: Very affordable, convenient size, quantity, would buy again if I need to.

Great product and great value and great vender!