General Tools AQ150 In and Out Aquarium Thermometer with Waterproof Probe General Tools and Instruments AQ150 In and Out Aquarium Thermometer monitors temperature in an aquarium or other marine environment The digital thermometer can measure temperatures ranging from -58 to 158 Degrees Fahrenheit (-50 to 70 Degrees Celsius) Digital aquarium thermometer has both minimum and maximum memory and a high/low temperature alarm; keep the water temperature right where you want it A jumbo digital thermometer displays temperature in the aquarium; toggle between ambient/remote sensor temperature and between Fahrenheit and Celsius The industrial thermometer design features both a backlight display and a convenient foldaway stand; CE approved