I have it for a few days and I acquired it for less than 10 euros. As for the temperature, it has a very small deviation within the same space and not always, of the order of 0.2 to 0.4 from a digital clock-calendar-thermometer that I have had for 10 years and is very accurate, while when you place them in the same place side by side, they have exactly the same temperature measurement, so it's great. As for the hygrometer, I don't have a comparison measure but it seems fine so far, when you change its location, the measurements change. On the positive side, it operates with a simple AA battery that you can find anywhere and it is convenient in terms of size with large indicators and has a blue backlight on the screen when you press the button on top.