10-Pack Mini Thermometer Hygrometer, Small Digital Electronic Temperature Humidity Meters Gauge Indoor LCD Display for Greenhouse, Garden, Cellar, Fridge, Mason Jar

These little sensors are so cheap and affordable that I am worried they'll break. But lo and behold, still going strong. I was also concerned they wouldn't be accurate or precise but in all of my testing, they've passed with flying colors.

Perfect for most applications Accurate & easy to read. Great value

These are nice hygrometers that have many uses. The quality is decent for the price point, and they all seem to be reasonably accurate and track together. I haven't tried calibrating them to a national standard for accuracy, but they aren't labeled as NIST certified, so that's not really an expectation. The humidity values track within 1% of what I'm getting from electronic equipment with internal sensors, so I'd say they're accurate enough for anyone looking at one of these for hobby or home use. The price for them seems fair as well, as they work out to be about $2 per piece.

They function great, but are incredibly fragile. Be careful if inserting them into a housing, they may come apart.

Good enough. Lighter than other ones I’ve purchased slightly, however reporting is consistent, that’s all that matters. 10/10

As far as I can tell these things don't work right by any means. I have them in sealed jars with humidity control packs and they are are not even close to what they should be reading. RH is at least 10% off what its supposed to be. I wouldn't recommend

These work great if you need to monitor the temperature of any items. We put them in the bags with our "herbs", and they kept the temperature right where it should be!

When this product arrived all of them seemed to be fine, except for one. The backing was popped up and the battery was corroded. No biggie, I’ll just use another one and replace the battery later. The next day, the new meter I was using made a loud snap sound from the back popping off, due to another corroding battery. So now I see, the batteries are cheaply made. I removed all their batteries and put them together to keep an eye on. 3 days later one of them literally exploded in my bag full of them (see picture). The meters themselves work great, the temps match up with my indoor temps. I can’t check if the humidity is 100% accurate but they all display almost the same humidity and temp when placed near each other. They are a simple meter with very little parts. If they come apart it’s quite easy to reassemble. It’s also important to know that the sensor is on the backing so you want to be careful not to block it when in use. I would have given this product a higher rating if the battery didn’t explode. If you buy this item just replace all of the batteries and it should be fine.

Perfect for monitoring the moisture levels in your container for 3D filament. Pleased with the price and performance.

A great deal for 10 units. Temperature & humidity great for jar storage DIY projects and greenhouses, Reliable and efficient. I recommend these to any serious gardener.

Hard to read unless directly in front of you. I mounted this in the lid of a dehydrator for drying filament and it does nothing for me in that orientation. In applications where you can look at it directly, no problem. Just be aware.

Nice hygrometers, show temperature in F or C, humidity is measured pretty well and precise between 20 and 99%. Lower than 20% shows only 14% and 10% values. Highest temperature I measured was 55C. But maybe it can show higher, I didn't test

Worx