Our range of clip-on, optical, long-travel and axial extensometers are designed to be used in all applications and conditions. We stock a wide selection of extensometers used to measure the actual strain of the specimens’ gauge length. Take a look at our recommendations below and find out more.  

Leading Manufacturers

We represent three of the World Leading Manufactures of Extensometers: Epsilon, MF and X-Sight. This ensures we have a solution that matches your exact materials testing needs. We don’t believe in compromises!  

Only a very small selection of the extensometers available are listed on our website, contact us today to speak with our experienced sales engineers. 

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Strain Measurement 

Extensometers are primarily used for material testing as they can accurately measure material properties. Understanding material properties is crucial for engineering design and quality control purposes.   

Extensometers are vital for identifying stress-strain measurements. They measure strain or displacement directly of the material or specimen being tested.  

A strain measurement is a requirement of most ASTM & ISO standards, and an extensometer is the most common method of measuring strain in a wide variety of materials and industries.   

The extensometer is used to measure the yield point elongation, compression, bend displacement, yield strength, strain hardening exponent, strain ratio or shear deformation of the material being tested.   

The key properties of a material such as total elongation, elastic modulus, offset yield complete the stress-strain curves. 

The strain is calculated by dividing the change in the test specimen’s length by its original gauge length.

Only a small selection of our extensometers are listed on our website; we have one of the largest ranges available from Epsilon, X-Sight and MF the three leading manufacturers of this type of instrumentation. Contact us today for expert advice on the correct extensometer for your exact testing requirements.  

With over 40 years of experience, we use a keen eye and stringent standards to offer the very best in extensometers.  

Clip on Extensometers   

The world’s largest range of clip-on extensometers from both Epsilon and MF.   

  • Axial Extensometers   
  • High Temperature Extensometers   
  • Fracture Mechanics Clip on Gauges  
  • Deflectometers (Deflection Gauges)  
  • Transverse and Diametral Extensometers  
  • High Temperatures Transverse and Diametral Extensometers  
  • Rock, Concrete and Asphalt Extensometers  
  • Averaging, Bi-Axial and Axial/Torsional Extensometers  
  • Bolt Proof, Lap Shear and Speciality Extensometers  

Optical Extensometers  

We offer two of the most sophisticated, cutting-edge optical video extensometers, from Epsilon the Epsilon One and the X-Sight range of video-based extensometers. We have solutions for every type of materials test!   

Long Travel Extensometers    

Our semi-automatic long-travel extensometer is a precision device that measures the strain on elastomers and plastics. These devices are used in conjunction with a Universal Testing Machine.   

Benefits of Extensometers  

  • Precision measurement  
  • A variety of types to fit a wide selection of applications and materials  
  • Easily adjustable & mounted for quick, accurate results. Our Epsilon extensometers can be used one-handed thanks to their special design.  
  • High-quality knife edges to minimise the chance of slippage  

Axial, Long Travel and Clip-On Extensometers  

Determine precise modulus & yield values with our wide range of extensometers. Our instruments can be used in all manufactures of materials testing systems and on projects across all sectors and material types.

We also have none contact Video, Laser, Averaging, Bi-Axial and Axial/Torsional Extensometers. As well as special solutions for high and low-temperature testing. Contact us about your measuring challenges and we will help you.   

Our Extensometer Manufactures   

Epsilon, The World’s Largest Manufacture of Extensometers! 

Offer Extensometers fully compatible with all brands of test machine  

Vast experience of developing the world’s best Extensometers for all types of testing across all material types. Epsilon will have a solution for your test! As standard, they have a range of 38 modules and 1000’s of combinations with the ability to offer bespoke extensometers.  

Epsilon’s service is exceptional with a team of true experts in the complex field of materials testing. Epsilon holds both ISO 17025 and ISO 9001 ensuring that it is the highest accuracy and quality!

Full Epsilon Catalogue download here   


X-Sight is a Czech-based and developed world leading DIC optical measuring system for a wide range of deflection and defamation materials analysis.   

X-Sight’s DIC based strain analysis systems are fully turnkey and are configured to work with any brand of materials testing machine. Focused on being user friendly with over 10 years of hardware and software development.  

MF Mess- & Feinwerktechnik GmbH  

Renowned German extensometer manufacturer. Offering a wide range of extensometers, including clip on, long travel, high temperature and special purpose extensometers.   


AML Instruments – Tried and Trusted  

AML Instruments have been the industry leaders in instrumentation and calibration expertise. We pride ourselves on our customer service, competitive pricing and leading accreditation.

With over 40 years of experience, we have used our unique insight to offer you leading Extensometer technology that you can trust. 

For more information or advice please get in touch.