Marina Meridian Thermometer

Hagen Marina Meridian Thermometer is an easy-to-read liquid crystal display (LCD) aquarium thermometer that is reliably accurate to plus-or-minus 1° F: no guessing, no color confusion. Mounts vertically and easily sticks to the outside surface of any aquarium.
Easy-to-read LCD display
1.75" Tall Thermometer Accurate 64-86° F
Mounts easily to outside of any aquarium
Just place this removable thermometer in an easy to read position below waterline.