Automatic Contacting Extensometer

The need for companies to increase specimen throughput to maximize efficiency and revenue while maintaining high quality standards and safe operating conditions has created a demand for increased speed, reliability and accuracy in their material testing routines. The AutoX750 (catalog no. 2665-750) is an automated long travel extensometer that fulfills this demand with sub-micron precision. With the benefit of automated gauge length positioning and attachment to the test specimen, operators enjoy a safer and simplified test routine. Companies gain faster cycle times and eliminate variability of critical test results brought upon by manual, time-consuming steps of traditional clip-on extensometers.

Request a Live Demo    View Specifications

AutoX750 Testing Plastics

Principle of Operation

The AutoX750 integrates with Instron's 3360, 33803400, 5500, 5960, 5980, and 6800 Series electromechanical test systems, as well as LX, DX, HDX, and KPX static hydraulic testing systems, and is controlled with Bluehill® Universal testing software via USB interface. The software provides an easy-to-use test sequence and setup that facilitates the automated gauge length, reference arm position and opening and closing of the arms before and after testing.

The counterbalanced measuring arms are virtually weightless, thus removing any influence on the material properties under test. The measuring arms are motor driven and will automatically position themselves to the correct position and gauge length every time.

Application Range

  • Tensile testing: metals, composites, plastics, and elastomers
  • Flexure testing: plastics
  • Specimen shapes: strip, round, hexagonal, and flat
  • Standard compliance: Conforms to the most rigorous testing standards, including:


AutoX750 Automatic Contacting Extensometer


High Travel
With its high accuracy and resolution across 750 mm of travel, the AutoX750 is ideal for a wide range of specimen sizes and gauge lengths.


Counterbalance Technology
Tried and tested counterbalanced technology eliminates external influences on the material under test to produce highly repeatable and reliable test measurements.


Automated Test Arms
Designed to provide simplified and safer test routines, reduce cycle time and high reproducibility. The automated arms attach to the specimen and can remain attached through failure for most materials.


Interchangeable Knife Edges
Swappable knife edges and adjustable clamping forces accommodate a variety of materials and specimen geometries.

ENDLESS Applications

The high accuracy and travel of the AutoX750 make it an ideal extensometer to accommodate all of your materials including metals, plastics, and composites. Determine a variety of calculations including modulus, offset yield, plastic elongation to failure (non-proportional), and r and n values for sheet metals.

Axial and Transverse Strain Measurement

The AutoXBiax (catalog no. 2665-751) is an automated high precision measurement device that measures both axial and transverse strain simultaneously. Developed using the same high accuracy optical measurement system as the AutoX750, the AutoXBiax is specifically designed to measure plastic strain ratio (r-value) for steel and exceeds current standards, including ISO 10113, ASTM E517, and JIS Z 2254. The AutoXBiax is compatible with the 3382A, 5960, 5980, and 6800 Series systems.

View Specifications


Request More Information