4-Pack Mini Digital Thermometer Hygrometer Indoor Humidity Monitor Temperature Humidity Gauge Meter with Fahrenheit (℉) for Humidors, Greenhouse, Garden, Cellar, Closet, Fridge Etc by DWEPTU

I have some moisture issues in my basement and wanted to get a sense of just how bad off I was, as well as how much improve t I would get from my dehumidifier. These little things have been very helpful and they seem to be accurate. When I place several right next to each other, they’re all within a point or so of each other, and they provide proof positive of the remediation I’m doing with the dehumidifier. As we enter into the winter heating season, I look forward to using these to monitor the humidity in my living space as well.

I got these to put around the house to get an idea of how affective the air conditioning is and how humid it is in the different rooms.They last a long time on 1 battery, it's been 2 years and I've changed the batteries once, you'll know when the battery needs replacing because the display will get dimmer and dimmer.However, I'm not entirely sure how accurate they are, I've done tests and one of seems to indicate that it's a few degrees higher in temperature, I haven't been able to test the humidity reading. For me personally, this is not a huge deal, I'm happy with a rough reading.So if you want 100% accuracy, this might not be a good bet but I'm happy with my purchase, they do the job I wanted them to do.

Good for what you pay for! Small.

Not very accurate and the screen goes out if exposed to too much humidity

Surprisingly good product. I recommend for all indoor medicine grows

Used in a wine cellar with a wired thermometer right next to it. The termperature difference was 10 degrees higher an inch away. Not sure about the accuracy of the hygrometer but temperature should be easier to be accurate.

The display needs to have a backlight.

Works

Recu sans collant 3m. Les batteries déjà dedans et aucun batterie additionnelle, probablement un retour qui m'a été envoyé. Rien n'est fonctionnel!

The RH reading on all of those is about 10% off and they all show different readings. (I compared it with slightly more expensive and trustworthy hygrometers). There is no way to calibrate them. You could argue that you can make a mental note to remember how much they are off but at this point, it's just hard to trust this device for anything that involves precision work, namely curing cannabis.

Doesn’t read humidity correctly. 10% lower then it should be and all 4 in the pack are like this and you can’t calibrate them. If you want accurate humidity readings don’t buy this