In-vessel Axial Extensometer

The deformation of rock samples can be measured by an axial extensometer, mounted directly on the sample. Not only are these highly accurate, but they are also very durable and measure strains on samples over a wide range of operating pressures and temperatures. An axial extensometer is placed between two clamps, which are mounted on the rock sample to be tested – this is done using coil springs to avoid platen interference. This series of extensometers is ideal for a variety of test types, such as:

  • Uniaxial compression-tension testing under temperature controlled conditions.
  • High-pressure/high-temperature triaxial tests.
  • Hydrostatic compression.
  • Asphalt, concrete or rock tastings.


The transducer set has different configurations, which can consist of single or dual axial deformation transducers (triple is optional between compression platens).
The dual transducer can be located 180° apart on the sample and has dual outputs, which can be recorded separately or averaged.
Extensometers typically connect directly to the test machine controller. The required connector and wiring is included in each package. This ensures it can be plugged directly into the controller.

  • Features
  • Specifications
  • Upgrade Options
  • Software
  • Standards
  • Applications
  • Easy set-up (installation and removal)
  • Highly accurate outputs that can either be averaged or independently produced
  • Exceptional temperature compensation
  • Measures strains on samples over a wide range of operating pressures and temperatures
  • A calibration certificate is included on request
  • Including electrical feed-through and quick-coupling connectors
  • Axial extensometers are placed directly on the rock sample by coiled springs to avoid specimen platen interactions
  • Averaging axial extensometers (including 2 or 3 LVDT)

Operating pressure 

Up to 140 MPa (20,000 psi)

Operating temperature

Various options up to 180 °C (356° F)

Measuring range

+/- 2.5 mm; +/- 5 mm; +/- 10 mm

Sample diameters

Various versions from 28 mm to 100 mm


0.1 % F.S.

Accuracy class


Output signal

2 MV/V

Signal conditioning

0-10 V +/- 10 V

Supply voltage

120 VAC/60 Hz or 230 VAC / 50 Hz

Custom sample sizes on request

  • Not available
  • Not available
  • Not available
  • Detailed information will follow soon
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