Keep your reptile friends happy and healthy with these Combo-Meters from Reptology Life Science by Penn-Plax. With both a Hygrometer and Thermometer included, this handy combo pack is a must-have tool for any thriving terrarium! Create the perfect reptilian environment with the hygrometer to measure moisture and a thermometer to monitor your tank's temperature for a balanced atmosphere at all times! Simple to install and designed with easy to see numbers, these Combo-Meters from Reptology Life Science are sure to contribute to a bourgeoning terrarium and happy reptiles!