The Fluval Advanced Electronic Aquarium Heater is a highly accurate, safe and feature rich heater for your aquarium. With easy to adjust temperature controls, you can quickly and precisely set in 0.5 increments. An integrated fish guard insures fish and invertebrates cannot come into contact with the heater core. With VUE Tech Technology, you can check the temperature of your aquarium anytime, in either Celsius or Fahrenheit, on the LCD display. The temperature readout will change color is the aquarium water varies =/-1 C or /-2 F or more from the pre-set temperature. If the temperature is of the water is affected by outside equipment and causes the aquarium water to rise or fall beyond 3 C or 5.5 F, the colored screen will flash indicating potential risk. Highly precise, safe, and reliable heater for your aquarium For 375 L, 100 U.S. Gal tanks