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

I bought 6 and they all read +-1 of each other after 24 hrs. in the same zip-lock bag. I put one in each of my filament bags and change the desiccant when it reads over 20% at 60°f. Ive found you cant maintain a low enough humidity to keep filament from taking on moisture above about 65°f and 20% is a good cutoff for getting too high. 19% (or lower) always yields good print results. Moisture symptoms start to be detected above20%. Im planning to get another 6 or so. Several months have gone by and the batteries are still fine. No telling how old they were already when they arrived.

The thermostat is very good very accurate but the adhesive that it came with doesn’t last long and doesn’t come off. But overall the thermostat is good! :)

I purchased these to replace the one my python knocked in her water dish and permanently damaged. I mounted these at opposite ends of my 40-gallon terrarium to obtain readings from both the warm and cool ends. In addition to coming with batteries already installed, it came with two sets of replacements, along with Velcro for affixing to interior walls. Use a custom-cut plate of plexiglass to tape under the screen cover to contain humidity, add a heat mat and thermostat and your climate control is good to go!

I think these are all made in one big factory in china, that said I ordered 2 and there was a 3 point difference in one of them, I did a hygrometer test ( google it) and figured out which one was off so I just add 3 to it and get the correct humidity. These are all a plus/or minus thing

I got these for the inside of my bearded dragons tank, and they adhere to the tank, easily or easily to read seem to be accurate

I use several of these to monitor humidity inside musical instrument cases. I occasionally check their calibration using hydrated potassium carbonate as a standard, and I have never found one more than one percent high or low. Allowing for the value of the four spare batteries if you bought them at a drugstore, the devices themselves are almost free!

Definitely worth the money you get two temperature/humidity gauges 4 sets of batteries and two velcro tapes. I am highly impressed both gauges were pretty much spot on and also were within 1 degree for temp and 1-2 points off humidity compared to my zoomed hydrometer. I want to note that the probe it is placed at the bottom of my gecko tank so there naturally would be a little bit of a discrepancy between the zoo med and the two aik tryee mini hydrometers. My zoo med hydrometer was about $10 this was half the price and you get 2 hydrometers plus extra batteries I wish I came across this earlier. I am happy with my purchase and will be purchasing more for my various reptile tanks.

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.

I bought these for my small cigar travel humidor and so far they seem to be very accurate. I put both in my humidor case, along with two 69% RH size 8 boveda packs and this is what they’re reading after a few hours (sorry for dark lighting, outside enjoying a fresh cigar). They also came with extra batteries and adhesive strips which Was a great bonus that I did not expect!! Very satisfied so far, but will have to see how they hold up as time goes on.

Simple little device that seems to be fairly accurate. Will work for what I need. One arrived with the battery cover broken. Used some tape to keep in place and it is fine. They are cheaply made, but I knew that when ordering. Came with extra batteries. Good overall value for the price.