Aquarium Masters Temp-Tec Professional Digital Thermometer for Hydroponics & Aquaculture, Amphibian & Reptile Terrariums, Freshwater Tropical Fish & Saltwater Fish Aquariums!! Professional Digital Thermometer for Hydroponics & Aquaculture, Amphibian & Reptile Terrariums, Freshwater Tropical Fish & Saltwater Fish Aquariums!! Sold By Pidaz Ideal for aquariums & reptile habitats. For use with both freshwater & marine aquariums, and great for monitoring temperatures in reptile & amphibian terrariums, and small animal habitats Protects reptiles, fish and small animals against unsafe temperatures. Uses one LR44, 1.5v battery (included). Suction cup included. Consider these other items: terrariums, aquariums, reptile heaters, basking lamps, heat emitters, mercury vapor lamps, hydroponics & aquaculture. Aquarium Masters Temp-Tec is trademarked and Pidaz is the only company authorized to sell Aquarium Masters Temp-Tec products on Amazon.com Accurately measure air and water temperatures up to +/- one degree. Easy to use selectable fahrenheit/celsius switch with large easy to read display. To turn on press and hold the power (pwr) button. To turn off hold the power button for 5 seconds. Do not submerge the LCD display unit under water