
1) Dimensional instrument
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https://www.crosswordclues.com/clue/extensometer

1) Extensimeter
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instrument for measuring deformation in object due to forces applied
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http://phrontistery.info/e.html

• (n.) An instrument for measuring the extension of a body, especially for measuring the elongation of bars of iron, steel, or other material, when subjected to a tensile force.
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http://thinkexist.com/dictionary/meaning/extensometer/

(from the article `materials testing`) ...test machine uniformly stretches a small part (the test section) of the test piece. The length of the test section (called the gauge length) is ...
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http://www.britannica.com/eb/a-z/e/61

An instrument or device used to measure deformation in a test specimen of a material.
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http://www.encyclo.co.uk/local/20539
Ex`ten·som'e·ter noun [
Extens ion +
-meter .] An instrument for measuring the extension of a body, especially for measuring the elongation of bars of iron, steel, or other material, when subjected to a tensile force.
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http://www.encyclo.co.uk/webster/E/95

Instrument for measuring changes in linear dimensions. Also called a Strain gauge. Frequently based on Strain gauge technology.
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http://www.instron.co.uk/wa/resourcecenter/glossary.xhtml

extensometer 1. An instrument for measuring minute degrees of deformation caused by tension, twisting, etc. 2. An instrument for measuring the deformation of metal under stress, or an instrument in which such deformation is used to register the elastic strains borne by other materials (e.g. concrete).
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An apparatus for indicating the deformation of metal while it is subjected to stress.
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https://steelforge.com/literature/steelog-the-5000-word-metals-glossary/

An instrument used in the testing of metals to measure small increments of deformation.
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an instrument for measuring minute degrees of expansion, contraction, or deformation.
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https://www.infoplease.com/dictionary/extensometer

An apparatus for indicating the deformation of metal while it is subjected to stress.
Found on
https://www.unifiedalloys.com/resources/glossary/
No exact match found.