Wood Galileo Thermometer 8.25" H by 1home 1home 100% SATISFACTION GUARANTEE ONLY Be sure to look for authentic 1home  Wood Galileo Thermometer and purchase only from authorized sellers from 1home . Searching for a way to measure temperatures like World Famous Explorer Galileo The thermometer works on the principle that the density of a liquid changes as temperature varies When the temperature rises, the liquid in the glass cylinder becomes less dense, and the heavier balls sink slowly to the bottom Our wood encased version allows for optional engraving to be done on the top of the thermometer or on the base. Overall height is 8.25". Gift Boxed with instructions.