I have had a good number of different ones over the years and most all of them broke. Oddly enough I have found these cheap analog ones have worked great and I have had them for many years. I no longer place digital ones in the cages and now just have one on each side of my snake room to monitor the entire room rather than each cage.
I've seen the analog ones like this not working accurately. What's your experience with the accuracy? Also these tend to never stay where you place them so I'd like to hear your solutions to that as well.