an instrument for measuring minute degrees of expansion, contraction, or deformation.

1885–90; extens(ion) + -o- + -meter

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World English Dictionary
extensometer or extensimeter (ˌɛkstɛnˈsɒmɪtə, ˌɛkstɛnˈsɪmɪtə)
an apparatus for studying small changes of length, as in the thermal expansion or mechanical compression of a solid
extensimeter or extensimeter

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Example sentences
Monitors can be divided into two basic types: roof-to-floor convergence
  monitors, and roof and rib extensometer monitors.
The extensometer measures this bulge and records it as a decreasing negative
Squeeze the buttons on the extensometer to set the gauge-length.
We provide both the extensometer and the tensor strain changes.
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