For hundreds of years, the mercury stick barometers were the most accurate way to measure air pressure and indicate changes in the weather. However, 21st century safety legislation banning the use of mercury necessitated the invention of an alternative, and these exciting, new, mercury-free instruments are the result of extensive laboratory research and development.
Take a look at our 'How to Guides' to find out more about barometers: how to set them up and how to use them to make your own weather forecast.
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