micro barograph

microbarograph

[mahy-kruh-bahr-uh-graf, -grahf]
noun Meteorology.
a barograph for recording minute fluctuations of atmospheric pressure.

Origin:
1900–05; micro- + barograph

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Collins
World English Dictionary
microbarograph (ˌmaɪkrəʊˈbærəˌɡrɑːf, -ˌɡræf)
 
n
a barograph that records minute changes in atmospheric pressure

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
microbarograph   (mī'krō-bār'ə-grāf')  Pronunciation Key 
A high-precision barograph, capable of resolving pressure differences with an accuracy of microbars.
The American Heritage® Science Dictionary
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