Calliger - Galileo Thermometer, Barometer, Hygrometer and Quartz Clock Weather Station - 100% Satisfaction Guranteed The rich, wood framed classic weather station measures temperature (galileo), barometric pressure (in and mbar), humidity (%) with analog clock. The Galileo thermometer consists of a sealed glass tube that is filled with liquid and several floating bubbles. The bubbles are glass spheres filled with a colored liquid mixture Attached to each bubble is a little metal tag that indicates a temperature. These metal tags are calibrated counterweights. The weight of each tag is slightly different from the others. As the temperature of the air outside the thermometer changes, so does the temperature of the liquid surrounding the bubbles. Backed by our 100% Satisfaction or Your Money Back Guarantee