High Elongation Extensometer

The high elongation extensometer is designed to measure the ‘stretch’ of a wide range of materials including plastics, rubber and elastomers testing, These extensometers have very long measuring ranges. Their unique design allows testing to failure and minimizes interaction with the sample. The initial measuring length, or gauge length, can be changed to suit the specimen size or the test standard that is being applied.

Extension is measured by attaching two counterbalanced extensometer clamps to the specimen at a pre-selected gauge length. When tensile forces are applied to the specimen by the testing machine, the slightest change in gauge length is measured by an optical encoder.

These models use high precision and its thumbscrew mechanism ensures accurate guage length adjustment. The HI-EL-933extensometer can be fitted to all sizes of screw driven material testing machine.


  • Quick release clamps
  • Single-handed specimen loading
  • Adjustable gage length
  • Spring-adjustable clamping force

Rigid and non-sensitive design especially for testing of rubbers and elastomers showing a tendency to wrap around the sensor arms at failure may be left on through specimen failure. The main body is stationary with only the lightweight traveling heads moving.

Large measuring range- 800 mm.

Low cost, high accuracy elastomers strain measurement.

Video Extensometer

Clip-on Extensometer

High Elongation Extensometer

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