Product review (5 stars): What can I say, they work.
Received the 4 pack, Temperature and Humidity Monitors. Tried them side by side and overall they where measuring almost the same values of temperature and humidity. After all, to measure humidity is not very straightforward to do it electronically; at least not for the price of this sensors. But it will give you an idea of the room humidity and temperature. I am using to determine the different changes in humidity throughout the day at my house. Since I am more concerned with the rate of change and not the absolute value, they work perfectly for me. I am very satisfied with my purchase.