laserXtens 1-32 HP/TZ

The high-temperature specialist for small specimens

The laserXtens 1-32 HP/TZ is equipped with a camera, two green laser light sources and a telecentric lens, which makes this extensometer ideal for testing of small specimens at very high temperatures up to 2,000°C. The measuring principle eliminates the need to apply gauge marks.
laserXtens 1-32 HP/TZ

Typical application laserXtens 1-32 HP/TZ

Metals to ISO 6892-2

  • Specific advantages for this application:
  • Strain-rate controlled tests to ISO 6892-2 (high temperature) and to ISO 6892-1 (room temperature) Method A1 (closed loop).
  • Measurement of transverse strain and deflection without additional markings and without required hardware expansion (software option).
  • Different gauge lengths can be set in fractions of a second.
  • The specimen is not affected by the laser light.
  • Even at elevated temperatures, sensitive specimens are not affected by the extensometer.
  • Sensor arms are maintenance-free and not prone to breaking.
  • Resistant to environmental influences (e.g. air currents); the flexible tunnel minimizes signal interference.
  • Temperature chambers and high temperature furnaces can remain completely closed. Openings are thermally sealed with glass windows.
  • Specimen markings are not required, saving time.

Key Advantages and Features

Testing without specimen marking

  • Testing without specimen marks
  • laserXtens' unique technology eliminates the need for specimen marking.
  • Significant time and cost savings, particularly with high specimen throughput.
  • The advantages are especially apparent with options covering multiple measuring points or entire specimen surfaces.
  • Easy to use in temperature chambers, where environmental conditions can make gauge mark application really difficult.
  • Ideal for automated systems - no manual specimen preparation required.

Simple operation

  • Tamper-proof: The housing of the complete systems are lacquered; nothing can be adjusted on the lenses. This is an important requirement for reliable test results.
  • Easy and fast height adjustment of the extensometer for simple alignment to the specimen: Through the connection to the crosshead, the laserXtens is aligned centrally to the gauge marks.
  • Compensation of various specimen thicknesses and testing of shear specimens.
  • Wear-free system, and as a result also low-maintenance. The systems have an extremely long service life.

High accuracy

  • ZwickRoell extensometers exceed the requirements of the standards and are calibrated over the entire measurement range to ISO 9513, in accuracy class 0.5.
  • Industrial-quality cameras and telecentric, low-distortion lenses.
  • In contrast to contact-type extensometers, the laserXtens HP/TZ can measure strain on short specimens (gauge lengths from 1.5 mm) with high accuracy.
  • laserXtens HP/TZ is mounted using low-vibration, stable holders.
  • Housing provides protection against dirt and dust and inadvertent misalignment of the components.
  • Exact synchronization of all measurement channels.

Automatic centering

  • Automatic centering increases measurement travel and measuring accuracy.
  • laserXtens tracks at half crosshead speed via the connection to the crosshead, keeping the testing operation automatically in focus and making optimum use of the measuring range.
  • This results in increased system accuracy; the gauge marks shift less in the image and are captured in the (more accurate) center of the lens.

Technical data


laserXtens 1-32 HP/TZ

Laser safety class to DIN EN 60825-1 (11-2001)


Initial gauge length

1.5 … 25


Measured displacement with speckle tracking[2]

For fixed assembly

32 mm - initial gauge length

For automatic entrainment

2 * (32 - initial gauge length)

Measurement displacement flow measurement

After reaching the max. measurement displacement, switch to flow measurement mode




Accuracy class to EN ISO 9513


Temperature range

-150°C ... +2,000°C

Measurement frequency for standard setup



Max. measurement speed at measurement point



Scope of delivery

Measuring head with one digital camera incl. high resolution telecentric lens, two green laser light sources, high temperature tunnel for reduction of environmental influences, software for image acquisition, evaluation of cross-correlation and transfer to testXpert III, accessory case with scaling aid, INC module (for tC: RS module). Incl. connection to crosshead; the extensometer tracks at half test speed.

  1. No protective measures required.
  1. If necessary, restriction implemented via furnace or temperature chamber

Software Options for the laserXtens Extensometer

Strain distribution

The Strain Distribution option enables determination of local strains at multiple measuring locations along the specimen gage-length. Evaluation of up to 16 measuring locations is possible. This option also allows automatic real-time symmetrical adjustment of the initial gage-length around the necking (as per ISO 6892-1, Annex I).

Second measurement axis

This option allows local transverse strain to be measured simultaneously with determination of longitudinal strain.

2D dot matrix

This option allows two-dimensional measurement of dots on a planar specimen surface. This enables determination of local strains and inhomogeneities of the specimen under load. X and Y co-ordinates plus the distances between dots are available as measured values.
Up to 100 measurement dots can be measured in any desired arrangement or in matrix form.
Display in testXpert III is limited to 15 channels.


laserXtens also determines the deflection for 3- or 4-point flexure tests. Measurement can be performed at one point (displacement of a measuring point) or at three points (relative displacement of the middle measuring point to the two outside measuring points) with a maximum measurement basis of 15 mm (laserXtens 7-220 HP 20 mm).