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

excellent, very consistent readings
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.

A great digital mini Hygrometer… let me tell you about it
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.

Good for mid-range humidity, unusable at the low end
Short story: I bought these to install in PolyDryer containers to replace the OEM unit that doesn’t have a temperature indication, but the units I received read too high at low RH to be useable for filament storage monitoring.The humidity readings all within good agreement between themselves and several other devices as long as they were in room ambient conditions in the 45-50% humidity range. However, I bought them to use to monitor 3D printer filament storage conditions where the goal is to go as low as reasonably possible, so I’m more interested in the values at low relative humidity (RH). I ended up wasting time trying to figure out why I couldn’t get the humidity in the storage container below 26% (re-drying descant and filament). I swapped between the four and they were consistent at 26%, so I didn’t initially think it was these meters. Then I started trying other meters in the same container and they were consistently lower.Eventually, after doing extensive tests and weighing desiccant to be sure it was fully dry, I did an experiment using a small container with a large amount of freshly dried desiccant, no filament, and all the RH meters I could fit. I believe all of the various meters were at their lowest reading (I don’t expect them to read accurately below 15% or so, but 26% isn’t good enough). After 10 hours in the container, I had the following indications:These rectangular meters (I only used 3 in this test, but the one still in the PolyDryer is also reading 26%):26%26%26%Similar inexpensive round meters:14%14%14%Similar rectangular meter removed from PolyDryer:10%ETHMEAS wired remote indicating temperature humidity meter:10%Ambient Weather WH31E Indoor thermo-hygrometer sensor13%I didn’t expect these to be perfectly accurate, but the specifications say they read down to 10% with a +/- 5% accuracy. While I don’t have a NIST-traceable humidity instrument for comparison, based on checks against 6 different meters from 4 different brands it appears these are well outside of that specification.3-stars because these might be fine if you need something for mid range and they are consistent between themselves, but at low RH levels, they read too high to be usable for my needs.

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Got these for my bearded dragon enclosure, they work perfectly and have long lasting batteries as well. Quick shipping. Definitely would recommend.