strain gauge

noun
Geology. a type of extensometer designed for geophysical use.
Also called strainmeter [streyn-mee-ter] , strainometer [strey-nom-i-ter] .


Origin:
1905–10

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World English Dictionary
strain gauge
 
n
a device for measuring strain in a machine or other structure, usually consisting of a metal filament that is attached to it and receives the same strain. The strain can be measured by the change in the electrical properties of the filament

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Example sentences
We are now monitoring the water table near the strainmeter.
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