OnceAll Digital LCD Fish Tank Aquarium Marine Water Thermometer 2 by UrDressing LCD screen, easy reading. High quality suction base, easy to install With long sensor cable Compact design for discrete use Submerge probe into fish tank, needn't submerge thermometer in water Temperature Range: -50C ~ +70C . Usage Temperature: -10C ~ +50C. Accuracy: 0.1C Digital Refrigerator Thermometer features ultra small and lightweight unit.