6-Pack Mini Hygrometer Indoor Humidity Meter, Mini Digital Thermometer Humidity Gauge Meter, Indoor Thermometer Hygrometer Monitor Fahrenheit (℉) for Reptile Thermostat, Jars Reptile, Fridge

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.

These are pretty well the industry standard. They are reliable and precise - though they won't detect below 10%, showing a steady 10% if the level is lower. Lots of uses (for example, desiccant boxes for 3D printers) are designed for this specific meter to snap in place.But they came with the batteries already installed, which is not a good idea, and I dropped them by a star in the rating for that. If you've bought much in the way of small electrical devices that use coin cell batteries, you've seen the little plastic strips that you pull out to turn them on. Yea, these didn't have those. If you're not going to use them all right away, remove the batteries before storing them. Fortunately, the batteries last a long time, so the short delay on the distributor shelf and in shipping before you get them shouldn't deplete them. I took the batteries out, lined them up in a roll with the polarity all going the same direction, and applied a strip of clear tape on one side of the roll. It wrapped about half-way around, which works well to keep them contained while keeping it easy to remove one or two batteries from the end.

I bought these many months ago. I wanted to wait and see how they worked.They work great!I have one in my IKEA plant cabinet, one in my propagation box, a few on my Barrina plant shelves, and one by my window where I keep some of my cuttings.For the price these can’t be beat!Thanks! 😊

Fast changing, extremely sensitive, and in tight sync on humidity. I bought 18, and placed then in a row across my work bench. After they settled in, they were within 1% of each other in a very interesting way... You could see waves of change, if one went up by 1%, usually it's neighbor would, and that would ripple across the line. Or there might be several waves sweaping from an end and the middle... It was interesting to see that they were all responding to the environment in sequence with the neighbor. This tells me they are quick responding and fairly sensitive.I am in an extremely dry environment, with humidity artificially increased by a swamp cooler, so I am testing the low end of the range, 20% to 30%. If your humidity dwells higher, you may get different results. These type of i9nstruments are more accurate at 75-85% than they are down where I use them, so accuracy is not pertinent in my use case, Instead I will be using these as a quality of storage indicator and alarm, so when I pull a roll of 3 year old nylon down, I can tell if it needs a 2 hour dry cycle or if it needs days more. A "freshness" indicator that I can read without opening the package.Humidity was within 1% of the units neighbor. However temperature was closer together, but the fractional degrees were all over the place... Most of the temperature sensors are closer than the humidity, but because the temperature scale is hundreds of points in either direction, the temperature looks like they are a little father apart, but really they are as close or closer than the RH%.The quality of the sensors are very high to all be in agreement, but these are too cheap to be calibrated, if that is important to yo, do some testing with a calibrated meter. I have a wet bulb and a calibrated meter in the shop, but like I said mine are not being used in a way for best accuracy, but these seem surprisingly high quality so I suspect accuracy is either very good, or at least very repeatable and consistent. These are the best I have tested so far.I will package these with sealed and dry filament, and the levels read will be wrong... Th