Mini Hygrometer Thermometer 2PCS Mini Digital Humidity Gauge, AikTryee Hygrometer Indoor Humidity Monitor, Temperature Humidity Gauge Meter for Humidors, Greenhouse, Garden, Cellar, Closet, Etc

Have compared to other various hygrometers in a humidor, and these are spot on within 1%.

EDIT: Using my infrared heat gun, these were 1-2 degrees off. Not enough to matter if youre using these to gauge growing plants or keeping temperatures for a pet terrarium or similar function, but worth mentioning. Either that, or the heat gun is off. I have no way to calibrate either to know which is 100% perfect. Original post: I cannot confirm accuracy, but from using these around the house the past few weeks Id say the temperature is accurate. Both read pretty much exactly the same for temp and humidity when they are near each other. if I breath on them, the humidity level jumps quickly to 100% (OK, it only has 2 digit places so it stops at 99%), so I think they are close enough for my needs. My needs? I have a bearded dragon and that means I need to have live insects to feed him. So I have to keep the insects at a steady temperature and humidity level so they are healthy when it is time to feed my dragon. So this is perfect. I cut a little rectangular hole in the bin, pop this in and these batteries (if they are anything like the last ones I owned) will last for a few years. They sent extra batteries, but goodness knows if Ill know where they are when these original batteries eventually give out. I only needed one, so I took the other upstairs to the bedroom. The humidity was really low (its winter now), so this helped convince my wife that we needed a humidifier in the house. The first was too small, but my wife told me this morning that she could tell a difference in how she felt the following morning after the humidifier was running. I may toss this into the bearded dragon terrarium too. They need to be kept at a certain temperature and humidity level too.

As others have stated, the hygrometers were operating out of the box since the seller already stuck the batteries in before shipping it out. Theyre small, light, and have a clear and easy-to-read LCD screen. I bought them to monitor humidity in my guitar cases, so their size and lightness are perfect for fitting into the little available space around the guitar and Im not afraid that theyll do any damage to the guitar if they come lose from their adhesive on their own (although itll be a different story if its from something like the guitar case being jostled around). They also come with double sided 3M tape strips and a new set of batteries per unit which makes this a very good deal. Also as noted by another reviewer, almost the entire back side of the unit is occupied by the battery door which means ideal places for mounting are limited to the narrower sides. While this made mounting a bit more finicky, theres enough surface area to be able to securely adhere the double-sided tape to the top and to the desired surface. It doesnt feel like itll come off unless I really pull on it. Out of the box, there was about a 1-2% humidity difference between the two units I purchased and temperatures were about .5-1 degree off. I reset them as specified by the seller in the Q&As by removing the batteries and leaving them out for about 10 minutes before putting them back in. After the reset, the difference in numbers was the same, but after about 5 minutes of acclimating and letting them sit side-by-side on their own, they matched each other exactly. Im assuming that the initial number differences may be due to very sensitive sensors that are reacting to the heat/moisture of your fingers after handling. I also think that the units do take a few seconds to register any changes in humidity/temperature, but that works perfectly fine for my purposes. For example, if youre moving it from a humid greenhouse to a dry exterior then youll probably have to wait a few minutes for the numbers to gradually ramp up/down. If you want more responsive hygrometers you may need to look elsewhere, but if your monitoring situations arent critically dependent on instant read numbers, then this is a perfectly adequate solution.

Purchased a set of two, used a Boveda One-step calibration kit over 24 hours to establish a baseline for both hygrometer readings: (1) Temp read 4 degrees low (displayed 69* to actual 73*); humidity read 3% high (displayed 78% to actual 75%) (2) Temp read 3 degrees low (displayed 70* to actual 73*); humidity read 4% high (displayed 79% to actual 75%) According to the product documentation Temperature measurement accuracy: ±2℉; Humidity measurement accuracy: ±5%RH. These systems were out of spec for temp and within spec for humidity. Im using these in clear plastic containers to store cigars while I reseason my humidors. As a rough guide they work fine, the display is clear and easily readable through the container wall. DONT rely on these as precision instruments though, pickup a more precise hygrometer for a long-term solution. (Xikar makes a nice one that can be calibrated)

This works well and for the price you cant go wrong.

I grow plants in a tent, and have to check the humidity levels. These are a great value, but they dont last very long. One lasts, about the time of each grow to harvest, so I have to buy a new pair, about once per year, if I do two harvests per year, but these dont cost very much, so I think thats fine The downside is the adhesive tape, barely stays on, so be careful where you put it, or use another adhesive. it also makes it near impossible to change the battery, but these dont last long, so that isnt much of an issue The display is really easy to read, and its very accurate. Thats why I dont mind replacing them every year. These are cheap, but the value of accuracy, is paramount when growing things in a tent

2 units and extra batteries came in the box. Work well, does what its supposed to do.

Does what it says on the tin. Simple, easy to read, and reasonably accurate.

After I bought my first solid wood guitar, I started researching guitar care. The most noteworthy thing I found was the importance of making sure your humidity is not too low or too high, which can destroy even the highest end of guitars over time. I had no earthly idea what the humidity was in my house so I purchased these cheap hygrometers. It’s been 6+ months and the battery’s are fine on both, and the two read the exact same number side-by side, so they get the job done. Come to find out my humidity is in the optimum range pretty much year round, but it gave me peace of mind that I wasn’t letting my expensive instrument degrade over time.

I purchased these gauges to keep a watch on the humidity in my guitar cases.