No worries - Always good to question the information you are being provided to make sure you a making an informed decision.
Once you get your thermostat in, you will use adhesive to adhere the probe to the bottom of the UTH. Then by placing the outdoor probe from your thermometer on the inside, direct above the UTH, you can calibrate your thermostat to make sure you have the appropriate temp on the hot/basking side of your enclosure.
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