The Geotherm Adjustable Under Tank Heater is the optimal primary or secondary heat source for reptiles, amphibians, invertebrates, small animals, and planted terrariums. The adjustable control allows you to set the perfect temperature for your pet, and create an ideal temperature gradient throughout their habit. To further ensure your pet’s safety and well being, we suggest using a digital thermostat with a temperature probe in combination. The Geotherm UTH has 3M adhesive that creates a tight bond and allows for better heat transfer than standard adhesives.