Extensometers for materials testing

Very High Resolution Digital Electronic Calibrators – Model 3590VHR

Epsilon’s very high resolution calibrator features 20 nanometers (0.8 microinches) resolution and has 50 mm (2 inches) of measuring range. The 3590VHR is provided with software to display the calibrator readings and optional netbook PC or digital display. The 3590VHR calibrator meets the accuracy and resolution requirements for ASTM E83 Class B-1 for a 6 mm gauge length and greater extensometers and ISO 9513 Class 0,5 over the full measuring range of the calibrator.

36 EXTENSOMETER MODELS are available in many thousands of variations. Our focus on helping customers has led to the development of models to cover nearly any test method.

Operation of these, and all of Epsilon’s extensometers, are


using in-house calibration systems that are calibrated with Epsilon’s laser interferometer system.


to the materials testing community, you know we will be there to stand behind our products when your critical application requires it.

The 3590VHR uses a coarse adjustment screw for large displacements, coupled with a fine adjustment screw that allows fine adjustment to within approximately 0.025 microns (about 1 micro inch). When it comes time to calibrate your extensometers, these calibrators are easier to use and faster than any others on the market. They have enough measuring range to calibrate nearly all extensometers, and enough resolution to calibrate units with low measuring ranges.

The software is included and provides readouts in millimeters or inches. The autozero function is a great help in calibrating. Just activate it to start readings from zero. The digital display reduces operator error.

A wide range of adapters are available. The calibrator comes with smooth round adapters of 9.52 mm (0.375 inches) diameter. For special adapters, contact Epsilon. For very long gauge length extensometers, an optional extension post is available. The calibrator is provided with a calibration traceable to NPL (UK standards organization).

Download Data Sheet

  • Scale calibration traceable to NIST.
  • System fully calibrated traceable to NPL (UK standards organization).
  • Software for Windows-based PC provided; a PC with a USB port is required.
  • Readings taken on the PC with included software may be save to a data file.
  • Uses the same adapters as the model 3590 and 3590HR calibrators.
  • Provided with a foam-lined storage case.
  • Optional Netbook PC or stand-alone digital readout display.

Download Data Sheet

Measuring Range: 50 mm (2 inch) maximum displacement

Maximum Range: 0-125 mm (0-5 inches) (maximum gauge length + displacement)*

Accuracy: ±0.19 µm (±7.5 µin) over any 0.12 mm (0.00475 inch) range

Meets ASTM E83 Class B-1 for a 6 mm gauge length and greater extensometers and ISO 9513 Class 0,5 over the full measuring range of the calibrator.

Resolution: 20 nm (0.8 µin)

Temperature Range: 18 °C to 28 °C (64 °F to 82 °F) operation**, -10 °C to 60 °C (14 °F to 140 °F) storage

Relative Humidity: <90% (Non-condensing)

Connectivity: USB 2.0 interface, self-powered

Weight: 3.6 kg (8 lbs) (standard configuration)

Adapters: Ø9.52 mm (0.375 inch) posts included*

EMC Compliance: BS EN 61326-1: 2006

Environmental: EU Directive 2011/65/EU (RoHS)

* Other options available upon request
** Recommended range



Download Data Sheet

Digital readout display
Optional extensometer adapter sets, extension posts, and horizontal configuration kit:
Smooth, round 6.35 mm (0.25 inch) diameter adapters
3590-02 Adapters for flat specimens
3590-3549 Adapters for Model 3549
3590-3648 Adapters for Model 3648
3590-03 Adapters for clip-on fracture mechanics gages
3590-04 Transverse extensometer adapter (Model 3560BIA)
3590-11 Transverse extensometer adapters (Models 3575AVG, 3575, 3475, 3580, 3565, 3911 and 3975)
3590-11-KIT Horizontal conversion kit for transverse extensometers – consists of legs for horizontal configuration, additional springs, and 3590-11 adapters; enables verification of transverse extensometers in the orientation that will be used for testing, as required by some calibration and verification standards
3590-06 Adapters for large averaging extensometers (Models 3542RA and 3442RA1)
Circumferential adapters for Model 3544
3590-4013 Shear adapters for Model 4013
Shear adapters for Model 3421
 100 mm (4 inch) extension post for long gauge length extensometers
3590-55-10 250 mm (10 inch) extension post for long gauge length extensometers
3590-55-24 600 mm (24 inch) extension post for long gauge length extensometers
Custom – contact Epsilon for adapters to fit Models 7650A, 7650, 7651, and 3567
Note: Model 3590VHR and 3590 calibrators include 9.52 mm (0.375 inch) diameter smooth round adapters

Download Data Sheet

Product Videos

Digital extensometer calibrator with software position readout

3590VHR Extensometer Calibrator Software Demo

With Epsilon’s in-house laser interferometer system, the full high resolution calibrator system can be verified to ASTM E83 and ISO 9513 specifications traceable to NPL. No longer do customers have to rely on micrometer head only calibrations. With Epsilon high resolution systems, you are assured compliance. When looking for a calibrator to meet ASTM and ISO specifications, the accuracy of the device is key for compliance, which is why full system calibration is essential to meet ISO 9513 and ASTM E83 requirements.

Epsilon is one of the only companies in the world with the capability to perform full system calibrations on high resolution extensometer calibrators.

Model Number:


Standards Labs in most countries have signed a Mutual Recognition Arrangement CIPM MRA. This includes the NPL in the UK, NIST in the USA and many others. This makes them effectively traceable to each other. Services of the NPL are equivalent to those offered by NIST and are recognized by NIST through this agreement of reciprocity.


If your unit is in need of service, calibration or repair, initiate the RMA process with us and we will be happy to assist.

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