Extensometers for materials testing

Epsilon Technology Product Line


  • 7 models in this group cover tension, compression and cyclic testing
  • Huge variety of gauge lengths and measuring ranges
  • Temperatures from -265 to +200 °C (-450 to +400 °F)

High Temperature Axial

  • 5 models cover a variety of applications for high temperature testing
  • 1 un-cooled model for use inside chambers up to 600 °C (1100 °F)
  • 4 models for use with split furnaces and induction heating up to 1600 °C (2900 °F)

Fracture Mechanics Clip-On

  • 3 models cover a broad range of gauge lengths, measuring ranges and temperatures
  • For fracture mechanics and fatigue crack growth tests in compliance with various standards
  • Temperatures from -265 to +1600 °C (-450 to +2900 °F)


Deflection Gages
  • Widely used for 3 and 4 point bending tests, compression tests and general deflection measurement

Transverse and Diametral

  • 4 models cover most any test requirement and can be used with axial extensometers at the same time
  • Miniature and standard units
  • Extensometers for r-value of sheet metal
  • Available options cover temperatures from -265 to +200 °C (-450 to +400 °F)

High Temp. Transverse & Diametral

  • 1 un-cooled unit for use inside chambers to 600 °C (1100 °F)
  • 1 model for use with split furnaces and induction heating, to 1000 °C (1830 °F)

Rock, Concrete and Asphalt

  • 7 models cover axial, circumferential and diametral testing on aggregate material

Averaging, Bi-Axial and Axial/Torsional

  • 4 models for axial averaging, axial/transverse, axial/torsional, and in-plane biaxial over a wide range of temperatures
  • Temperatures from -265 to +1600 °C (-450 to +2900 °F)

Bolt Proof, Lap Shear and Specialty

  • Specialized extensometers for
    • Bolt proof testing and elongation measurement
    • Elongation of rebar splice assemblies
    • Lap shear, sandwich core shear, and rigid cellular plastic shear
    • Testing while submerged in liquids


  • Examples of modified standard extensometers and application-specific extensometers

Knife Edges

For Extensometers
  • A complete selection of knife edge styles to match many different specimen types and applications

Interface Electronics & Signal Conditioners

  • For customers who do not have signal conditioning as part of their test controls
  • 1 analog and 4 digital versions for strain gaged sensors


For Extensometers
  • 2 digital models. Choice of 1 micron or 20 nanometer resolution (50 microinch or 0.8 microinch), both with 50 mm (2 inch) travel.
  • 1 model for axial/torsional calibrations
  • Provided with calibration traceable to NPL

Calibration References

For Extensometers
  • A simple and inexpensive way to transfer Epsilon’s calibration of an extensometer to the signal conditioner in your test system controls

Download Product Guide

Axial and High Temperature

Shunt Calibration

SCM Shunt Calibration Modules

Knife Edge Options

Available for Epsilon Extensometers


If your unit is in need of service, calibration or repair, initiate the RMA process with us and we will be happy to assist.

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Download Catalog

2016 Extensometer Catalog, Version 108 is now available! Not finding something you’re looking for? Ask us about a custom quote.