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.

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.

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 this 6-pack of hygrometers to monitor humidity levels inside my filament storage bins, and they’ve been excellent so far. The small size is a big plus. They fit easily inside each bin without taking up space, and they’re easy to position where I can see them. All six units agreed with each other right out of the box, and they also matched the readings from another hygrometer I’ve owned for a long time. That consistency gave me confidence they were accurate. The humidity bottoms out at 10%, which is fine for my use. My bins hover right around that range with desiccant packs. The temperature reading is a nice bonus, even though I don’t really rely on it. Overall, these hygrometers have been perfect for keeping an eye on my filament storage. Simple, consistent, and exactly what I needed.

These things are great. Each one is about the size of a Lego. Normal house humidity is supposed to roughly be 30-50%. Our basement seemed damp and our bedroom seemed too dry. These meters are very responsive -- moving them to different rooms shows an immediate adjustment. The price is amazingly affordable, particularly for six meters. Easy to read -- shows room humidity as well as room temp. I like the small size because they can be placed in inconspicuous locations.

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.

Great product, well priced. Good accuracy when compared to a standard RH meter