Extensometers are used in materials testing to determine the strain (modulus, yield) on specimens in semi- or fully-automatic operation. In this section you will find various extensometers as clip-on extensometers, long-travel extensometers as well as non-contact or optical extensometers.

Extensometer are accessories for 

Product catalog

Universal Testing Machines (PDF)

Clip-on extensometer series MFA and Mini MFA

The Clip-On extensometer MFA and MiniMFA is equipped with a linear strain gauge measuring system. Its measuring accuracy exceeds all requirements by the standard EN ISO 9513. It is suitable for all tests starting from an initial gauge length of 10 mm. Its design, which has been tried and tested over many years of use, guarantees a high level of reliability and a long service life even under difficult operating conditions. The Clip-on extensometer are particularly suitable for determining the module of elasticity, proof stress and ultimate strain. The operation is quick, straight­forward and easy, and therefore enables efficient tests of a large number of items.

Features / Equipment:

  • Accuracy class 0.5 or 0.2 (EN ISO 9513)
  • Measuring length from 2 mm to 25 mm (depends on version)
  • Gauge length from 10 mm
  • Low weight but solid construction
  • Easy changing of extended measuring arm (gauge length)
  • Adjustable clamping force
  • Low activating force

Extensometer series MFX

The extensometer MFX is suitable for almost all samples from a gauge length (Lo) of 10 mm. Because of its rugged construction and high accuracy the MFX nearly meets all applications in measurement of linear strain (determination of the E-modulus up to sample fracture). The MFX works without restrictions in both the upper as well as the lower testing area.

Features / Equipment:

  • Accuracy class 0.5 (EN ISO 9513)
  • Resolution max. 0.01 µm (1 Vpp) or 0.05 µm (RS422/TTL)
  • Gauge length from 10 mm
  • Automatic movement to the position and initial gauge length
  • Automatic attachment on the specimen
  • Measuring travel:
    - MFX 200: 200 mm
    - MFX 500: 500 mm
    - MFX 700: 700 mm
  • Low activating force (max 10 cN)
  • Operating range in upper and lower testing area possible
  • Available also in high resolution (0,01 μm) version

Long stroke Extensometer L700 / L1100

The long stroke extensometer L700 / L1100 is particularly suitable for determining the elongation at break of plastics / elastomers with high elongation. The setting of the initial position (start position lower measuring arm) as well as the initial measuring measuring length Lo and the opening and closing of the measuring arms is done manually by the operator.

Features / Equipment:

  • Accuracy class: 1 (standard) from 10 mm travel, according to DIN EN ISO 9513
  • Measuring principle: incremental
  • Measuring path: 700 mm or 1100 mm ./. Lo
  • Resolution: 10 μm
  • Temperature range: 10° ... 50°C
  • Initial measuring length: Lo = 10/ 20/ 25/ 50/ 75/ 80/ 100 mm

Video extensometer ONE1

The video extensometer ONE employs the most advanced Digital Image Correlation technology reaching state of the art. Its ease of use and compactness make the ONE device currently the most Xsighting device for strain measurement.

ONE combines high-precision measurement with a user-friendly graphic interface to help focus on the experiment itself during tensile, compression, bending, shear, torsion, and fatigue testing.

Features / Equipment:

  • Default single-cam measurement length: 240 mm (130 mm)
  • Default resolution: ISO 9513: Class 1 (Class 0.5); ASTME 83-10: Class B-1
  • Gauge length: selectable single or multiple gauge lengths
  • Data acquisition rate: 75-200 Hz
  • Axial and radial neck detection
  • Torsion testing
  • Lighting: auto-switching light
  • The devices are stackable. For longer specimen, two or three ONEs can be mounted next to or on top of each other.

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