4-Pack Mini Digital Temperature Humidity Meters Gauge Indoor Thermometer Hygrometer LCD Display Fahrenheit (℉) for Reptile Tank,Jars,Guitar Case,Greenhouse, Garden, Cellar, Fridge, Closet

Overall very happy with price and performance. I was concerned due to the variances some customer reported in readings. However the four I got have very little variance - less than a .5 a degree and no more than 1% humidity in a controlled environment. Very acceptable for this price. The units are somewhat smaller than I envisioned, but with a sharp display that is easy to read as long a you are facing it directly. Given the air ports on the back side, I made sure to not cover them when mounting the units on a wall (I used a thin strip of nanotape).Note that temperature is the smaller number, which might be an issue for folks with severe vision issues.Overall, I'd buy these again. Helped me immensely to identify cold spots in the house!

Why did you pick this product vs others?:these are excellent... I was testing temp variances in different parts of the house, and the four have very consistent readings.

These are easy to use and work okay. The screen doesn’t work great on one of them. For the price they are good.

It is indeed a great digital humidity and temperature meter and I write this in the given order since (in my opinion) it's primarily designed to read the humidity and therefore the humidity reading is much larger on the liquid crystal display (LCD) than the temperature reading. I purchased this because I was primarily interested in the humidity around the house at various locations, with the bedroom and living room being most important. I also have a very large plant that resides inside the house during the winter months and so here too, I'm very interested in the local humidity.I've found the humidity readings to be quite consistant between the four meters (the 4-pack purchased). And euqally important, when compared to a reference that I've established with another meter, after stabilization they're very close to being spot on... really amazing. And the temperature readings are even more accurate and stabilize very quickly.Of course, the fact that the meter is very small in size is nice since this makes it very portable, allowing you to easily move it to your desired location. Some have remarked that an attachment mechanism such as double sided tape should be provided. I personally do not agree, primarily because I wish to move the units around freely.Each meter operates on 2 small LR44 "button" type batteries. Although they are factory installed when you receive the meters, I've checked all eight batteries and they all seem to be fresh, reading somewhere above 1.50 volts. And because this is a LCD display, I expect them to last a reasonably good period of time... guessing at least 8 months but probably more. And when replacement is necessary, they're inexpensive and easy to come by.The cost of the 4-pack mini's , from Amazon, is currently $13.99, in my opinion a real bargain for such a well designed monitoring device.Finally, let me add a word about their customer service. I had an issue with one meter, got in touch with the company, and in less than 24 hours received a full and satisfactory reply. For them, customer satisfaction is real.So if you're looking to monitor your humidity and temperature at various locations around the house, don't think twice about purchasing this product... I highly recommend it.

Very accurate,fast shipping,works like expected.

These worked for a while but eventually started not working. A few of them I was able to replace the battery but two of them didn't bring em back to life. They may have been in too humid of an environment as the screens look like they got wet but didn't have anything spilled on them. They were cheap and worked good while they did. Seemed like they were pretty accurate when checking against another meter and had a good range of measurement.

Love them!! Use them in a large tank for reptile that needs it warm & humid. Because size of tank was hard to determine what both were across the tank as well as what and where to adjust. Nice this provides both, the display is large and works great. I needed 4 for my application, so bonus came with 4. They're easy to see and perfect size. Moisture hasn't interfered with the display.

In all honesty, these have been amazing for my Pac-Man tank. The only issue that I found and the only reason why I did four out of five stars was because originally I was using only two of four these meters in my tank. I soon realized I needed to use three of them, and then realized I wanted to use the fourth for another tank.. so I took it out of the package. Everything was normal then I noticed that the fourth one wasn’t quite reading correctly. The humidity number is not portrayed correctly on the screen at all, you can’t even really tell what number it’s at for humidity, I tried taking it out the humid environment and leaving it alone for a few days. Tried putting it in some rice just to dry it out, then in front of a fan. Just in case it was a humidity issue and if something like too much humidity got inside of the meter itself and wasn’t letting it portray the correct numbers on the screen. Tried that out didn’t work. Nothing worked so not too sure what’s wrong with the Hydrometer, though- I’ll say the fourth one itself was acting up before I even put it into the tank, so I don’t believe it was the tank nor humidity that caused the issue of the meter itself. It was also the only one that did not come with a pull tab on the back as well, so maybe that was part of the issue as well?? So that’s why I put four out of five stars for my review. Other than that they work great!! I recommend these highly :)