6 Pack Mini Hygrometer Indoor Humidity Meter, Digital Thermometer Monitor

A very compact unit with a nice clear display that is very readable from a distance and off-angle. I think it has much better quality than the price suggests, and all six of mine were functioning on arrival. I was surprised they don't use battery pull-tabs to activate - they're using up battery life as soon as they leave the factory, so I guess I'll see what I get out of them. The accuracy also seems to be well within the spec. It's wild how many reviewers don't understand what ±5% means... It would be completely fine to see 46% on one and 54% on another if the actual RH is 50% - but mine are within a couple points of each other, and match with my Govees and other weather station type sensors.

you do not need a 15-45$ hygrometer to see what levels of humidty and temp your humidor or fridge is at. These work at all levels ive tested so far. Freezer? yes Fridge? yes. Humidor? yes. hot window ceil? yes. Closet and room? yes. All around amazing. Great battery life. theyre so cheap anyways just buy another set. The size is small. They can fit almost anywhere you put them. small rectangular hygrometers. For my humidors? i have at least 2-4 in each of them. They read almost within 0.5 rh and 0.8 F of each other. I love them. i wish someone reccomended me these when i started cigar buying.

Got these to measure humidity inside a 3D filament case. They have been working great for the last 2 weeks. Can't vouch for battery life, they arrived turned on, so we'll see how long they last. Humidity readings are with 1 % of each other, not bad for such an inexpensive product. Temps are 1.5 to 2 degrees off. As far as I'm concerned that's fine. I'm not using for some scientific experiment here. Overall very nice.

For the price these work great. I use them in the AMS connected to my Bambu Labs P1S printer. If you look at all of them next to each other, there are slight variations in the measured humidity and temperature, but that's to be expected with a hydrometer at this low price point. So, not the last word in calibration accuracy, but usable. My only real complaint is that I wish the readability of the screen was a bit better off-axis, but that's probably too much to expect here. I should also note that the batteries came pre-installed and the units were on when I opened them, so I am not sure how much of the battery was consumed while they sat in a warehouse. I haven't had to change the batteries yet, but I expect these will likely not last as long as if they were fresh.

If I could I’d give this 4.5 stars. All six are within 1% RH of each other in a couple of different environments, and with a different hygrometer . 5 within 1 degree of each other for temperature. The half star I’d like to take off is because the temperature display on the 6th display was missing a few segments in the 10s digit, but after a few days all segments of temperature digits were gone. No more deterioration in the last few weeks. Given the great price/value, however, it doesn't deserve four stars.

A great way to keep an eye on the humidity of 3d printing filaments. I keep one in every container with filament. When the humidity gets above 20% I know it's time to recharge the dessicant. These are easy to read, very inexpensive, and work well.

They do what's intended of them. Not 100% accurate but close enough for my intended use. If you need 100% accuracy you may wanna get a better product. The batteries last about a year and that's fine for me at this price range.

a little off on humidity and temp about 1-2 for both but keep that in mind it is overall great for what you need. and if you do not need all of them take the batteries out save for later.