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As the temperature of the air outside the thermometer changes, so does the temperature of the water surrounding the bubbles. As the temperature of the water changes, it either expands or contracts, thereby changing its density. So, at any given density, some of the bubbles will float and others will sink. The bubble that sinks the most indicates the approximate current temperature. The rich, solid wood framed cherry weather station with lacquer finish measures barometric pressure (in mbar and inHg) and humidity (%). The barometer allows for sea-level calibration up to 3,000 feet. Note: Barometer only operates to about 3.000'. Do not purchase this unit if you live at or above appx 3.000' altitude Size: Thermometer diameter: 1.4 in. Instrument diameter: 2.75 in. Overall Height: 10 in. Details: Number of glass balls: 5 Characteristic of glass balls: Sliver plated balls.