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

These mini hygrometers work great and are perfect for monitoring humidity and temperature in different areas of the house. I like that the 6-pack lets me place them in multiple rooms and quickly compare the readings. The display is easy to read, they're small enough to put almost anywhere, and the readings have been consistent between the different units. They're especially useful for keeping an eye on humidity levels and seeing which rooms may need better ventilation or dehumidification. For the price, you get a lot of value with the 6-pack. Simple, accurate, and they do exactly what I needed. Highly recommended!

They work great! The display is clear so I can see both the temp & humidity level easily. Convenient to have several around the house in different rooms, so I can be aware of the humidity levels throughout the house. They are small, but for me they're big enough to see.

Yes, they were all running (from the factory) and yes, they all show different temperatures and relative humidity and yes, none of them match a real temperature/humidity gauge. BUT, once you know one of them is two or three numbers high or low, it is consistent... it will always be wrong by the same number!! So they do work and they are accurate... they are just NOT calibrated with anything in the real world or with each other. As long as you remember "Temp is +2 / RH is -3" or whatever (and don't get them mixed up), they are worth what you paid for them.

I got these to keep track of the humidity where I store my 3D printing filament. I don’t need them to be precise, but they seem to be accurate enough. They’ve been great for that. I have one mounted in each desiccant box, which has been working really well. The display is easy to read. I didn’t buy these for the thermometer, but I do like the added functionality. Just for fun, I put one inside my car. I did learn that the display stops being readable at about 132 degrees. But 2 months in so far and all of them still work just fine. They seem to be a pretty decent value.

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

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.

I tested these in the bovida hygrometer test bag and they were all within one degree of humidity reading. they seem fairly accurate. I was pleased with them overall. Size is great being it does not take up a lot of space in my humidor. very easy to use.

These mini hygrometers are compact, accurate, and easy to read. They work great for monitoring humidity and temperature in terrariums, grow tents, or around the house. Buying them in a multi-pack makes it easy to place one wherever it’s needed.