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Extensometer
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Extensometer is an instrument that measures the elongation of a material under stress. The elongation of the material is a physical deformation of the sample and is a type of strain associated with tensile measurements. Along these lines, extensometers are one part of a variety of tensile tests including the determination of yield strength, tensile strength, yield point elongation, strain-hardening exponent and strain ratio.
The Extensometer selection depends on the application