Overview: This weather ball storm glass quickly indicates any changes in atmospheric pressure You can use the storm glass barometer free standing on its own, or put it into a project with a wood base. The air trapped by the liquid maintains a steady pressure. When high pressure & good weather are approaching, the liquid is pushed down the spout When low pressure & bad weather invade your region, greater pressure trapped inside the water barometer causes the liquid in the spout to rise. If liquid spills out of the top, you should take shelter It will predict barometric weather changes by observing the rise & fall of liquid in the storm glass. All you have to do is to add colored distilled water & the storm glass is ready to go. Variations in barometric pressure are immediately indicated by the level of water in the spout This handsome barometer thermometer uses a blend of old & new technology to interpret the weather Specification:1 x Injector 1 x Filling pipe 1 x Manual Weight Approx:189.8g Size Approx:8.5 x 7 x 13.5