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The pointer that does not move except by a knob, usually on the front, is just for comparing the movement of the pointer which reads barometric pressure. By lining them up, you are able to detect slight movements easier. I think that's the only reason for that other pointer. Hope this helps.

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12y ago

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What is an aneroid barometer called?

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An aneroid barometer is different from a mercury barometer in that it does not contain?

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