Absolutely!
In fact, we recommend you use at least two thermometers within the terrarium. One should always have a thermometer located in the basking area to monitor the basking temperatures. You want to make sure your bearded dragon is receiving ample basking heat, and on the other hand you want to make sure the temperatures do not get too high.
You also need to locate a thermometer on the opposite side of the terrarium in the cool zone. Having a thermometer here will help to determine if the cooler zone is too warm or too cool. You want to create a good temperature gradient across the terrarium. There’s no better way to do this than by having thermometers on both ends.
It is also a very good idea to place a hygrometer that measures humidity levels in the terrarium. Place the hygrometer towards the center of the terrarium (away from the basking lamp) for the most accurate readings. You can use thermometer-hygrometer combo gauges to measure both temperature and humidity at the same time.
Always use high quality thermometers and never guess what the temperatures are within the terrarium. It could mean the difference between a healthy bearded dragon and an ill one.
For more information on temperatures and thermometer placement, please read Proper Temperatures for a Bearded Dragon and Humidity Levels for Bearded Dragons.
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