Gotcha. Well, this is what I used with my MI cage, and it seemed very accurate--both for RH and temp:
http://www.amazon.com/Cooper-Atkins-...er+thermometer
Pro: It takes humidity at the probe, so the body of the thermometer can sit outside the cage (where it won't be subject to being snaked.)
Con: The probe is too large to really be used in the warm side hide. . . . Although it would be okay for ambient readings.
It's the only device with a hygrometer in the probe I've ever used, so kinda by default, it's the only one I can recommend![]()