a device for measuring pressures below atmospheric pressure in the receiver of an air pump, in steam condensers, and the like.
Origin of vacuum gauge
First recorded in 1860–65
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British Dictionary definitions for vacuum gauge
any of a number of instruments for measuring pressures below atmospheric pressure
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012