JBL DigiScan is an aquarium thermometer with a large digital display for displaying the water temperature in the aqaurium. The Themometer is mounted on the outside of the aquarium glass and displays the temperature in the Aqaurium very accurately and clearly readable.JBL Aquarium Thermometer DigiScan+ digital aquarium thermometer that displays water temperatures from 0-40C in 0.1C increments+ attachment: Insert the battery, remove the protective film and simply stick the thermometer onto the outside of the aquarium pane+ the 2-part velcro sticker makes the thermometer easy to remove at any time+ accuracy: 1.0C+ battery: 1 x AG13+ dimensions: 6.5 cm x 5.0 cm+ digit size: 2 cm - easy to read+ DO NOT immerse the thermometer in the water!+ the thickness of the aquarium pane is not a factor+ the water temperature is very precisely forwarded through the aquarium pane to the temperature contact on the back of the thermometer+ package contents: 1digital aquarium thermometer, incl. bat