SODIAL(R) Water Submersible Waterproof Digital LCD Thermometer For Aquarium/Fish Tank Aquarium/Fish Tank Water Submersible Waterproof Digital LCD Thermometer Temperature range: -50~ +70C. Accuracy: 1C. Operation Environment: 0C - 50C. Power supply: Button Battery (DC1.5V). Dimension: 45mm x 55mm x 28mm (approx). LCD size: 27mm*13mm (approx).