EWPJDK Humidity Meters 6 Pack Mini Digital Electronic Temperature with Fahrenheit (℉) for Humidors, Refrigerator, Greenhouse, Garden, Cellar, Closet

These hygrometers are amazing. Very useful for precise humidity and temperatures during and after sowing. I put them directly under the dome..works great.

I need to monitor the humidity is a number of jars. This six-pack was perfect. The unit is simple. They come with batteries. There's no on/off switch. They are ON all the time. They are accurate as far as I can tell. All six units respond to temperature and humidity precisely. The small, compact design makes them easy to work with as well.

These seem to be decent temperature accuracy. What I didn't like is that they came already activated. By that I mean there was no plastic bit to stop the battery life from being used, so who knows how long these sat in a box running down the batteries. The build quality seems good and the speed at which it detects temperature changes is good.

Like many others here, I'm not using these for gardening or preserving historic paintings in a controlled environment - no, no.. I'm using these to monitor the humidity levels around 3D printing filament. As simple and as silly as it may sound, raw filament does absorb moisture and will cause expansion and popping of the absorbed moisture when it is fed thru a several hundred degree heated print nozzle, leaving bad marks on the prints and unmelted plastic in the nozzle... So, to combat this, we use hygrometers, to monitor moisture content.. The devices that I received were all powered on and reading well. There was 1 or 2 that were out of sync with the rest of the group by a percent or two, so it's not extreme precision, but the work wonderfully enough to get a good read on what is happening in the environment. I say these get a passing grade from me. I appreciate their simple build, good looks, and efficient reads.

Great price. These let me track the percent humidity throughout my home to make sure it stays under 60% (the threshold for mold growth). These sensors are really great for getting the information you need for controlling home air quality. If you’re prone to respiratory illness, have asthma, live in a humid climate, or a home with questionable ventilation, buy these. I know these are mainly used for reptiles, but I found them extremely helpful for my own health as well as that of my pet. Apparently our home regularly stays at over 80% humidity throughout, swaying between the low 70s and high 90s % humidity. It means the air is permanently heavy and everything is slightly sticky. Humans generally should aim for the 40-50% range. For asthma, humidity between 30-40% is recommended. This sensor pack let us find out how our behaviors from shower temperature to closed/open windows affects the moisture in the home so we can aim for a healthier balance. It’s the most important tool for staying on top of mold/spores and bacteria in the air. Landed up purchasing a dehumidifier and these sensors are very accurate and in tune with the changes, even if they take a minute or two to adjust. I wish they had a small place for a hook or screw so I could hang them instead of having to find places to stand them up, but so far no complaints.