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You also get a manometer to monitor pressure and better time your shots.

For nearly 400 years, air pressures have been measured using mercury-based instruments called manometers.

Moreover, the technique measures pressure directly, using a fundamental constant of nature, meaning metrologists can derive the pascal without relying on previous measurements of other quantities, such as density, which the manometer depends on.

Numbers from manometers, measuring the pressures distributed along a wing.

Medical devices Certain medical and monitoring devices – including barometers, thermometers, hygrometers, manometers and blood pressure monitors – will be banned by 2020.