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Galileo did lots of cool things with his telescope and whatnot. But we think this definitely is in his top 3 inventions. Watch the glass spheres as they rise or sink when the temperature causes the density of the liquid to change. Each sphere has a corresponding temperature tag, and the lowest sphere in the upper stack displays the air temperature with surprising accuracy. Guranteed to make any kitchen, office, or classroom look quite a bit cooler. This beautiful glass reproduction contains 7 colorful spheres to read the temperature from 68oF to 80oF. Measures 43 cm (17 in.) high. Five Year Warranty.