Petzilla LED Digital Aquarium Temperature Controller with NTC Sensor Probe, Fahrenheit&Centigrade Adjustable,110V ac (1100W) Dual working modes: COOL & HEAT Adjustable output delay function to protect compressor Support reading with Centigrade or Fahrenheit unit Plug and play design, easy to use Widely used in aquarium, reptile market, incubators, green house, refrigerator etc