laserXtens 1-15 HP

The laserXtens 1-15 HP is the specialist for small specimens. It provides highly accurate, non-contact measurements of deformations in a measurement range up to 14 mm from a measurement length of 3 mm, without the need for gauge marks.

  • The laserXtens does not require specimen markings, which is particularly beneficial in the case of small specimens. This saves both time and money
  • A telecentric lens compensates for lateral specimen movements
  • Measurements on specimens with a width/diameter starting at 1 mm, and even smaller after pretesting
laserXtens_1-15 HP_+FO

Compensating for lateral specimen movements 

With some specimens or test arrangements, the specimen is prone to moving out of the test axis. This is especially common with small specimens. A change in the specimen distance to the camera does however, in a trapezoidal field of view, result in an magnification/demagnification of the specimen, whereby the test results are influenced. The telecentric lens of the laserXtens 1-15 HP compensates for these lateral specimen movements and minimizes measurement error.

Typical application laserXtens 1-15 HP

Mini and micro specimens: stents, fine wire, mini metal specimens

  • Specific advantages in this application
  • Contact-type systems cannot be used for these as they are unable to access the specimen.
  • No influence on the specimen - no contact, no specimen marking.
  • Out-of-plane movement compensated for by telecentric lens.
  • Resolution: 0.04 µm - no comparable system for micro specimens.
  • Accuracy Class 0.5
  • Time-saving - no specimen marking required.
  • Our competitors have no comparable product with laser speckle technology.
  • Customizing - can be connected to special temperature chambers to test sensitive specimens at uniform temperature.
  • laserXtens 1-15 HP has no moving parts and is completely wear-free.
  • Option: 2D dot matrix over the entire specimen, at different measuring points or whole surface.

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

  • Easy 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.
  • Simple alignment to the specimen: Through the connection to the crosshead, the laserXtes is aligned centrally to the gauge marks. This can be done very quickly due to the ease of height-adjustment. (not for laserXtens 1-15 HP).
  • 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

  • High accuracy down to the last detail
  • laserXtens possesses high precision in the micro and macro measurement ranges.
  • ZwickRoell extensometers exceed the requirements of the standards and are calibrated over the entire measurement range to Accuracy Class 0.5, ISO 9513.
  • Calibration in Accuracy Class 0.5 to ISO 9513 with first calibration point from as early as 20 µm.
  • Industrial-quality cameras and high-quality, low-distortion lenses.
  • Specimens from 1 mm in width/diameter can be tested; even smaller specimens may be possible following pre-testing.
  • In contrast to contact-type extensometers or pure video instruments, laserXtens can measure strain on short specimens (gauge lengths from 3 mm) with high accuracy.
  • Extensometer mounted using stable, low-vibration mounting arms.
  • Housing provides protection against dirt and dust and inadvertent loss of adjustment of components.
  • Exact synchronization of all measurement channels.
  • A tunnel minimizes environmental influences such as air currents.

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.

Software Options 

testXpert III testing software offers various options for precise, traceable non-contact extension and strain distribution measurement. 

Test re-run

The optional Test ReRun module enables subsequent recalculation of strain on the basis of an image series recorded during a test, using a different initial gauge-length (provided multiple markings are present). This can be particularly advantageous in component testing, for example, when it is necessary to evaluate local strain at different locations, or in standard tensile tests when specimen necking has occurred outside the original initial gauge-length.

Automatic symmetrical adjustment of strain around necking to ISO 6892-1, Annex I

The recalculated strain can, of course, be synchronized subsequently with the other measurement values via the testXpert testing software.

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).

Video Capturing

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.

Second measurement axis option 

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

Deflection measurement 

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).

Technical data

laserXtens 1-15 HP


laserXtens 1-15 HP

Item No.


Initial gauge length

3 ... 14


Measurement displacement with speckle tracking


mm - initial gauge length

Measurement displacement for flow measurement

After measurement displacement via speckle tracking, laserXtens switches to flow measurement.



μm to EN ISO 9513

Accuracy class

To EN ISO 9513


According to ASTM E83


Typical measurement frequency (adjustable)



Measurement speed, max. at the measurement point



Specimen thickness

Flat specimens



Round specimens

0.5 ... 30[1]












Ambient temperature

+10 ... +35


Minimum version

testXpert II V3.71 or testXpert III

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


Scope of delivery

Measuring head with one digital camera including telecentric lenses, two red laser light sources, software for image acquisition, evaluation of the cross correlation and transfer to testXpert III, accessory case with scale aid

  1. Pre-tests are required for specimens with a specimen diameter < 1 mm.
  1. No safety measures required.