Saim Aquarium Fish Tank Water Terrarium Vivarium Temperature LCD Digital Thermometer Easy to apply suction cup and easy to read LCD screen; Temperature readings to within 0.1 degree Easy to use Flip to switch between  and . Temperature range -50 degree Celsius~ + 70 degree Celsius; Operating temperature -10degree Celsius~ +50degree Celsius Powered by one LR44 button cell (included) Notice:Submerge probe into fish tank to measure water temperature (Submerge probe only, do not submerge thermometer in water)