12 Pack Pgzsy Mini Small Digital Electronic Temperature Humidity Meters Gauge Indoor Thermometer Hygrometer LCD Display Fahrenheit (℉) for Humidors, Greenhouse, Garden

These hygrometers are awesome! super affordable, super reliable as I have triple checked them several times and they've been accurate each time. they last forever I stick them in all my mason jars with my boveda packets and they work like a charm!

I’ve bought these hygrometers two or three times now. They just work. Packaged well, quick delivery, no worries about whether I might get a bad one, easy to read, perfect size for my projects. Excellent product and will definitely be buying again.

This is my 3rd box of these. I use them in a lot of things. Fair warning, the face is not heat resistant to the rated temps. DO NOT put them inside an enclosure that goes over 130f, it will destroy them. Ask me how I know.Otherwise, these work as advertised. They're reasonably priced too.

Very practical and easy to use, size accommodate the jars that we are using without taking space, so far no issues and humidity levels seems to be pretty accurate

Seller was fast at getting the item to me. Item did have what appeared to be water damage staining on the box, but was not wet or deformed at the time of delivery, and the internal parts showed no obvious damage. I believe the packaging was wet at some point in the warehouse storage from FBA Warehouse, or the Manufacturer's storage.I use these hygrometers, as many others do, in 3D printing filament storage. When storing filament, the difference between 25% humidity and 35% humidity is the difference between needing to put your filament thru an 8 hour drying process and delaying printing of your model by that much time. So, if a sensor is wrong it could cost me a whole day of production, and possibly wind up irritating the customer that shipment of their anticipated item wasn't shipped out quickly.The numbers are large and readable. The temperature and humidity readings are quite quick to change - They update every 1-2 seconds. The issue that I have with these items are two-fold.1. They aren't accurate to the actual humidity percentage -- and I'm not just saying that, I did several tests to confirm before choosing to not keep these as a reliable instrument in monitoring my storage solutions.2. One of them repeatedly turned off when shaken or moved. Not sure how or why, but that's not a great sign! Once it was tapped gently on the table or given a soft shake, it would come right back on, which tells me it's not a battery voltage issue.Some of the readings weren't even close. Even between themselves, as a whole pack of 12, these sensors were showing a high degree of variance from one to the next. It wasn't anything crazy like 20% off, but it was 2-8% of variance between the lowest reading and the highest reading, while sitting within 18 inches of each other.I said I tested these in several ways, so i'll tell you now HOW --Between taking photos for each test the item was allowed to sit in the environment for several hours to ensure that it wasn't reading something absurd like a fairly moist gust of air from a cough or something silly. No - these were tested in a manner that would be scientific. All within a reasonable distance of each other, in the same room, and in a room that had active air flow and no external factors like a pool, faucet, toilet, sink, or anything silly to throw off the readings.I have a hygrometer from another brand which reads several humidity points lower than the product that I received listed here. So, since they don't match up within 1-2% of each other, this product has failed that test.Next, I decided to put it against my Marathon Atomic Clock which has temperature and humidity sensors built in. The item listed here would show the temperature to be the same but the humidity reading was way off. So, it failed that test.I have an AMS with my 3D printer, which cost several hundred dollars; I trust the sensor in it WAY more than I do this little 10 cent sensor. I let them sit in this AMS box, which is a weather-sealed containment unit, meant to keep filament dry with the aid of desiccant media that absorbs moisture. They sat in the AMS unit for at least 8 hours before I took the photos you see. The AMS sensor would show 17%, while the on-screen display for this item was showing 20%. So, it failed that test. While it's not terribly inaccurate in that case, it showed a decent amount of variance that I wasn't too happy with it. If it wasn't for the other testing I had done, and the power reliability issue I have with a few, I would call that "good enough" to keep them.Lastly, I placed all the sensors in a bag a moisture-absorbing desiccant media, thinking that maybe (as a long shot) some of the sensors could be clouded by residual moisture inside their plastic clam-shell housing, for whatever reason. These things get manufactured in a place where it's known to be quite humid, and then shipped across the ocean... I wanted to give these every opportunity to succeed. If that meant spending a few hours letting them sit off to the side, in an effort to balance them to the environment, i was going to do it. I let them rest surrounded by moisture-absorbing beads for at least 4 hours. When I removed them, they were doing slightly better, but still not great. Immediately after removal they started reading the ambient air readings, which is good for me to see in terms of sensor responsiveness to air quality changes, but the readings were slightly off and varied across the 12 units i had, so it wasn't accurate. Fast but not accurate means nothing when I'm looking for the true number of the room. I don't care if it re-takes the reading only 1 time every 2 minutes or 1 time every 2 seconds. I need the reading to be accurate - and these were not.The value per unit is there, but you sacrifice quality to get more of an unreliable item. I would move on to another brand, if you actually care about getting a valid reading from your equipment.

I have bought others but these were better. They seem to be pretty accurate and are easier to read compared to others I have. I use them for different rooms and they fit nicely in mason jars to monitor humidity and temperature in the jar for curing "herbs".

I purchased these to track temperature and humidity in my incubators. I took all twelve out of the box and they all showed different temperatures and different humidity.I always set my incubatora up 2 days before I put the eggs in. I placed three of these thermometer/ hydrometer in 4 d8fferent incubators. I would check them every 3 hours in order to adjust the incubators. Of the four incubators, not a single one had 3 thermometer/hydrometer that had the same readings. They also did not have the same reading as the digital readout on the incubators.This made them totally useless. I was not able to make any adjustments to the incubators because I had no idea if any of the readings were correct. I am going with what the incubator readout say.I would have thought that at least half would read the same. Not a single one has ever had the same temperature or humidity, even when sitting side by side.I will be returning them.

Works great came with batteries that if it didn't I'd have to go buy mini size watch batteries but thankfully I avoided that option. I'll be ordering more soon