The info was about a digital thermometer. A thermometer measures temperature. A thermostat regulates heat sources.
Then go kick the pet shop employee who sold you everything, that is the #1 most important piece of equipment you can purchase. Without a thermostat a UTH can get hot enough to burn your snake in minutes. Go unplug the UTH before you have to pay for a vet bill and a thermostat.I don't have anything regulating the UTH or the lamps, but I wasn't aware that was a necessity.