For my Leopard Gecko, I have a 10 gallon glass tank, 60 watt lamp, under tank heater which is already attached to the tank (uth does not have a sensor) , and sand substrate. The problem is that both the lamp and the heater when used separately, each keep the tank warmer than they should. I realize I can get a 40 or 25 watt bulb to solve the day temperature problem, however, my dilemma is that I've been told that the uth should stay on 24/7 to ensure that it doesn't get too cold at night. I've heard of reptile owners buying something that the uth plugs into which has a sensor on it that can be buried in the sand at the warm end of the enclosure. The 3 pet stores in my city sell something similar to this but in all 3 stores, the reptile specialists have discouraged me from buying them and have said either that they don't work in sand, or just don't work very well. The cost has been between $25 & $35 for these products. I don't really want to spend that much and especially not on something that I don't have much confidence in. Does anyone have something to plug a uth into with a temperature sensor to put in the sand that works? If so, please tell me about it, like how much did you spend and where did you get it, etc.? Please help soon.