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Get some digital probes to measure ambient air temp. Temp on the cool side should be mid70's and hot side temps should be in the mid 80's. Remember a warm side is just as important as a cool side. I know that the temperature underground is cooler but I would suggest providing an actual cool side to the enclosure.
Get a temperature gun to measure basking temp although you can do it with the probes you just have to wait for them to heat up.