The Exo Terra Digital Thermometer and Hygrometer are each equipped with a remote sensor for accurate measurement and durability. These precision instruments come with a programmable minimum and maximum memory setting which can be controlled with one single button. The sensor is held in place with a suction cup, while the instrument can be mounted in three ways - with Velcro(included), with a screw or it simply slides into place on a new Exo Terra Compact Top or Dual Top. Key Features : Accurate temperature indication Remote sensor Minimum / Maximum temperature memory Fits the Exo Terra Compact Top and Dual Top Canopies,