WESTONETEK Digital LCD Fish Tank Water Aquarium Marine Vivarium Thermometer with Suction Cup Probe Cable, Black Easy to Read LCD Display, LCD screen size: 2.5cm x 1.2cm Suction Base, Ideal for positioning on Aquarium Glass Simply submerge the Probe into the Fish tank, Main body is not Waterproof Measures in Degrees Centigrade or Fahrenheit,Measuring range: -50C - +70C, Accuracy +/- 1C,Resolution:0.1C Power: 1 X LR44 button battery(included), Probe cable length: Approx.90cm