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Many barometers, manometers, blood pressure, and vacuum gauges contain mercury. Liquid mercury in the gauges responds to air pressure in a precise way that can be read on a calibrated scale.
These gauges must be recycled at the end of their useful lives. If the gauges are not recycled, the mercury may contaminate the water you drink and the air you breathe.
Mercury gauges occasionally need servicing to maintain their accuracy, which often results in elemental mercury waste that should be recycled. If you have a mercury gauge, recycle it and purchase a mercury-free replacement.