Exo Terra Digital Thermometer with Probe The Exo Terra Digital Thermometer with a remote sensor are a great way to monitor the temperature levels in your terrarium or vivarium, They come equipped with a minimum and maximum memory setting which can we controlled with a touch of a button. The sensor its self can be secured to the side of the terrarium or vivarium with the suction cup provided and the LED display can be secured on the outside using the Velcro included. If you have an Exo Terra Terrarium and also are using there compact canopy the Digital Thermometer simply slides onto the canopy via the grove in the top.