| Brand | Galileo |
|---|
Check the listing for details. Galileo 11.5" Glass Temperature Thermometer. Condition: Used. Listed at 19.99 USD. This Galileo thermometer is a decorative instrument used to measure temperature. It operates on the principle that the density of a liquid changes with temperature. The colored glass spheres inside the sealed tube are weighted to specific densities. As the liquid's temperature changes, the spheres rise or fall. The lowest floating sphere in the upper group indicates the current temperature.