microbarograph
American Heritage Dictionary:
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mic·ro·bar·o·graph
(mī'krō-băr'ə-grăf') 
n.
An instrument used to record very small changes in atmospheric pressure.
n.
An instrument used to record very small changes in atmospheric pressure.
McGraw-Hill Dictionary of Aviation:
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microbarograph
A sensitive barograph that records very small transient changes in atmospheric pressure. A micro-barograph permits reading directly to 1/10 of a millibar.
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American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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microbarogram
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