Very good hygrometer and reliable measurements. Ideal for measuring humidity in winter and adjusting household appliances like air conditioners and humidifiers/dehumidifiers. You measure the humidity correctly in every room. Essential for finding mold and checking why the house is cold.

I compared it to the measurement of a dehumidifier and a mercury thermometer. It maintains an error of about 5% for humidity and 1°C for temperature, as promised, as I had seen in a comparative video on YouTube with the more expensive Fluke, which costs 400€. It quickly changes its values, with the temperature taking 1-2 minutes to stabilize. It also automatically turns off after a while and has a backlight. I preferred to spend 17€ and get this one, rather than room thermometers-hygrometers at a similar price that take longer to refresh and I don't trust them much. Overall, it suits me well for quickly and accurately measuring different spaces.

Tip: Since the manual is not clear, to disable the automatic shutdown, you need to press mode+on/off when it is off. When you turn it off, it loses the setting and goes back to automatic. The process needs to be repeated when necessary (it's good so that it doesn't get forgotten on)

The measurements seem reliable. As for the negatives, I would say the battery cover is very fake. The battery doesn't last long if you have it constantly activated (it takes a little searching to figure out how to keep it permanently activated). It doesn't stand upright.

I have it for about 1.5 months, in combination with measuring my dehumidifier and thermometer, the values are very close.

It seems like a reliable and accurate humidity and temperature meter. It's worth its money.
Watch the presentation/unboxing video: https://www.youtube.com/watch?v=ynnMFpIgMQ4

It works perfectly, I am very satisfied. Within a second, it recalibrates when moved to another room.

Very reliable and accurate in measurements! Finally, a proper humidity & temperature meter for the home space!