Exo Terra ON/OFF Electronic Thermostat Exo Terra ON/OFF Electronic Thermostat – Reptiles are ectothermic. They use heat from an external source to thermo-regulate their optimal body temperature. Most reptiles use direct radiant heat from the sun in combination with conductive heat from sun-heated surfaces. These include branches, rocks or other heat accumulating structures. Providing such an appropriate, species related, temperature gradient in the terrarium is an important factor in successful reptile keeping. With the Exo Terra 100W Electronic ON/OFF Thermostat, you can create a well controlled heating system. This allows you to maintain the required temperature conditions similar to those found in a desert or tropical environment. The Thermostat will also help to prevent overheating and under-cooling during hot summer days or also cold winter nights. The electronic Triac switch keeps the temperature at the desired set point with a much higher accuracy compared to conventional thermostats and virtually eliminates temperature swings in the terrarium. Simply connect your Heat Mat, Heat Cable or Ceramic Heater to the Exo Terra ON/OFF Thermostat. Set the preferred temperature. Place the heat sensor in the desired spot. The Red LED heat indicator will light up when the heating device is ON. It shut’s off once the desired temperature is reached. The recessed dial of the thermostat will prevent accidental temperature change if the device is being handled. You can safely use the waterproof remote sensor in highly moist terrariums. Also use in aquatic environments. You should set the Exo Terra Thermostat according to the needs of the animals. Thoroughly research the preferred optimum temperature range (POTR) for your specific reptile. This is so you can create the correct temperature gradients inside the terrarium. This will allow your reptiles to thermoregulate.