Mini and light weight design. Large and clear LCD display. Wide Temperature Range (-50 ~ 99 °C) * Dual heating and cooling function. Automatic over temperature alarm * Control temperature by setting the temperature set value and the different value. Temperature Calibration * Refrigerating control output delay protection. Wiring diagram for installation included * This mini Temperature Controller is an excellent and convenient multifunction device for controlling temperature in Aquariums. The stability of aquarium temperature is one of the crucial factors that contributes to the health and safety of your fish. By utilizing the temperature controller, you can provide an environment with optimal temperature for your fish. This advanced temperature controller can measure and control temperature from -50 to 99 °C. This device is also suitable for Laboratories use and other temperature-controlled systems.