Skip links


An extensometer is a device that is used to measure small/big changes in the length of the sample under test. It is useful for stress-strain measurements. Depending up on the type of tests the extensometer is chosen.

KEY Differentiator

These extensometers are mainly split into two categories :
• Non Contact
• Contact

  • Video Extensometer –  For certain special applications, non contact extensometers are used for its added advantages especially where it is impractical to use a High Elongation or a Clip-On Extensometer namely the Video Extensometer.
    The up-to-the-minute Dak Advanced Video Extensometer (AVE) is a high performance non-contact extensometer with measurement performance that meets or exceeds that of traditional contact extensometers. High performance is matched by an ergonomic LCD color touch screen design in conjunction with Image Dimensioning Software (iDs) that allows easy set-up and provides very good operator access to the test area.

Contact extensometers can be subdivided into two further categories:

Clip-on Extensometer  These are clipped onto a specimen (hence the name “clip-on” extensometer) before carrying out a tensile test. These devices are used for applications where extremely high precision is required over a relatively small extension (a few mm).

High Elongation Extensometer –

Designed for measurement of higher extensions on plastics, rubbers, elastomers, cellular plastics, thin sheeting and films showing maximum forces higher than approximately 20 N. The special design of the gripper arms of the extensometer releases the specimen at break especially for testing of rubbers and elastomers showing a tendency to wrap around the sensor arms at failure.


- Gauge length adjustable from 15 mm to 50 mm

- Travel range 800 mm(with Series 9000)

- Travel range 1000mm (extendable to 1500mm up on request, exclusive to Series 7200)

- Resolution 0.005mm (exclusive to Series 7200)

- Accuracy of 0.05% (exclusive to Series 7200)

– Resolution 0.01mm(10 microns) with series 9000

– Suitable for Elastomeric materials like polymers, rubbers, plastics, etc

"r" & "n" Values Transverse Strain Measurement.

The AVE comes with an option for transverse strain measurement, which enables the determination of "r" & "n" values according to ISO 101 13 &ISO 10275 & yield strength in tensile tests according to EN10002-1

Sample Marking And Detection

Specimen marking & mark detection and tracking of markers on the specimens for measurement is the basic principle of the non contact strain measurement.

Various Extension Ranges

- Extension Range 4 mm- 25 mm - Gauge-lengths of 10 mm-50mm - Resolution of 0.001 mm

Various Extension Ranges

• Travel range 1000mm
• Extendable to 1500mm up on request, exclusive to Series 7200

This website uses cookies to improve your web experience.
error: Content is protected !!