Marina Dolphin Thermometer

The Marina LCD Digital Aquarium Thermometer features an easy-to-read liquid crystal display (LCD) that is reliably accurate to plus-or-minus 1°F: no guessing, no color confusion. It mounts horizontally and easily sticks to the outside surface of any aquarium.
Accurate and easy to read
3.125" Tall Thermometer mounts easily on outside glass
Removable
Just place this removable thermometer in an easy to read position below waterline. Reads temperature range from 72°F to 86°F.