Bel-Art, H-B DURAC Galileo Thermometer; 18 to 30C (64 to 88F), 7 Spheres, 17 in.

H-B DURAC Galileo Thermometer; 18 to 30C (64 to 88F), 7 Spheres, 17 in.

Galileo Galilei discovered when a liquid’s temperature increases, its density decreases. His findings inspired these unusual and interesting thermometers with colorful spheres which rise and fall to indicate temperature.

• Decorative, functional thermometers are a great conversation piece perfect for the home or office
• Sealed glass cylinder contains a clear liquid and several glass spheres of varying densities
• Tag on the lowest sphere in the top group indicates the current temperature