OP was talking about a thermometer.
For single setups, the Accurite digital weather station is great. It's intended purpose is obviously not for reptiles but it works great. It can be found at the home depot, lowes, or walmart for around $12.
It measures hot side temp (external wired probe) and cool side temp (sensor in the unit) and humidity (sensor in the unit).
It is the only thermometer/hygrometer you will need for a single setup
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