Thermometers come in all shapes and sizes
Prices also vary, but you can pick up a Temp Gun cheaply by shopping around,
same goes for a Digital (ambient) thermometer.
Temp Guns are best for measuring the Basking Spot's SURFACE temp and is also
handy for checking the water temperature at bath time.
While a digital thermometer is great for measuring the ambient temp
of the warm and cool side of the Dragon's enclosure.