The Exo-Terra measurement equipment are gauges which can be used for monitoring the humidity and temperature levels in the vivarium or terrarium. The Exo-Terra reptile measurement equipment are easy to read with a clear display and simple to install .
Exo Terra Thermo-Hygro Combometer, PT2470
Its a problem finding a decent meter to measure humidity, they all go off calibration or break very quickly. I don't think they are made to withstand the damp environment that regular misting of a chameleons viv is. But these combined ones do last longer than any others I have tried, and that includes the stand alone exo-terra ones. I cant give it five stars, because I don't expect it to work longer than the batteries in it will last, but I would buy this one over any other at this price.