I ordered 2 of these thermo / hygrometer for a terrarium. Have a top and a bottom attached and they work well (did it to test short in the refrigerator and humidity should also agree that values are realistic). Even my devices measure very quickly (other than those specified by Vorrezensenten), it takes about 20 seconds to perfectly acceptable for me. At first I was skeptical because of the price, but so far I am convinced. Let's see how long they keep. They came well packed and I think it's good that the same batteries are included. For the price you really can not complain, you get a good product, from me therefore a buy recommendation.
