ZooMed makes several different sizes of UTH's, with the most expensive around $45.00 @ PetSmart or Petco. I have two, one for each side of the tank, and they work great with the thermostat controls. I have an Accu-Rite measuring the "hot" side and the Humidity, as well as the ambient temp. I have another digital probe measuring the "cold" side. Identical hides on both sides. My snake seems very happy. She spends a lot of time in both hides, and can be "caught" in the middle of the night hanging out on a large branch I have accross the top of her tank.