vacuum gauge

noun
a device for measuring pressures below atmospheric pressure in the receiver of an air pump, in steam condensers, and the like.

Origin:
1860–65

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
vacuum gauge
 
n
any of a number of instruments for measuring pressures below atmospheric pressure

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Operating pressure or vacuum is measured using a pressure or vacuum gauge, such as a manometer.
The vacuum gauge and the water-flow switch share the other.
The outer wall also has a pump out port, vacuum gauge connector, and a vacuum burst disk.
Cut and fit the pipe from the quick disconnect up to the valves and over to the vacuum gauge.
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