Jump to the content of the page

Longstroke Extensometer

The sensor arm extensometer for elastic materials Download
Max. measurement range
  • 1000 mm
Temperature range
  • Ambient temperature
  • Up to 250°C
Type of test + change in width
  • Tensile tests
  • Cyclic tests
  • Elastomers
  • Films
  • Flexible plastics
  • Leather
  • Textiles

The extensometer for elastic materials

The longstroke extensometer is designed for tests on extensible plastics, elastomers, films/foils, textiles, leather and similar elastic materials.

It is primarily used for direct extension measurement on specimens with medium and large extensions in tensile and hysteresis tests and also in temperature chambers (using extended sensor arms). The robust mechanical design of the guide assemblies, together with the extensometer’s swiveling knife-edges, ensures safe, reliable operation with specimens prone to whipping such as elastomers.

Longstroke Extensometer

Function description
Advantages and features

Function description

The fundamental component of the extensometers is a precise guide profile with two weight-compensated measurement carriages. The two attached sensor arms with interchangeable knife edges are suitable for round and flat specimens, as well as notch-sensitive materials. The gripping force of the sensor arms can be adjusted at the specimen.

The sensor arms and knife edges (round/straight) are included in the extensometer scope of supply.


The long travel extensometer is suitable for direct extension measurement on all elastic materials, including elastomers, plastics, leather, textiles, etc. and can be used for exact determination of offset yield and strain at break in tensile tests. Standards-compliant secant modulus or E-modulus determination with the specified initial gauge length is not provided.

Advantages and features

  • Can be used up to specimen break, even with high loads and brittle specimen material.
  • Very high resolution over the entire measurement range.
  • Very large measurement travel.
  • Synchronous force-displacement acquisition.
  • The drag forces are very low.
  • The long travel extensometer can be combined with all analog or digital clip-on extensometers or with a manual transverse strain extensometer.
  • The extensometer is controlled automatically via the test program. At the start of the test, the sensor arms are attached via electric motor. At the end of the test they are detached and the initial gauge-length is reset via the crosshead movement.
  • The extensometer has a robust construction with impact-resistant measurement system.
  • Low-friction measuring-carriage mounting minimizes transmission errors.

Do you have any questions regarding our products?

Please feel free to contact our product experts.
We look forward to discussing your needs.


Contact us

Related products and accessories


Name Type Size Download
  • Product information: Longstroke extensometer PDF 516 KB
  • Product information: ProLine longstroke PDF 269 KB
  • Product information: zwicki longstroke PDF 839 KB