ZOO MED HYGROTHERM CONTROLLER This is a Zoo Med Reptile Hygrotherm Humidity & Temperature Controller in One. It maintains proper terrarium temperature and humidity levels. It has a temperature control range between 10°C to 50°C. It controls temperature by turning on/off heating devices when in HEAT mode or by turning on/off cooling devices (e.g. fan) in COOL mode. You can set an alarm that will flash when the temperature or humidity reaches extreme high or low levels. It can control up to 1000 watts of combined temperature and humidity control devices.