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 calibrator meets the accuracy and resolution requirements for ASTM E83 Class B-1 for extensometers with gauge lengths ≥6 mm, and meets ISO 9513 Class 0,5, both over the full measuring range of the calibrator. The 3590VHR includes a Touch Display digital readout and PC software.

38 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 calibrator has the high resolution and accuracy required to calibrate and verify extensometers to ASTM E83 Class B-1 and to ISO 9513 Class 0,5. The 3590VHR’s resolution is 20 nanometers.

Like all of Epsilon’s extensometer calibrators, the 3590VHR is itself calibrated using a laser interferometer at our ISO 17025 accredited facility. The 3590VHR is provided with a calibration that is traceable to NPL in the UK, which has equivalency to NIST and many other national standards organizations. A calibration certificate is included.

These calibrators are fast and easy to use due to the simple controls and large digital readouts. The 3590VHR has coarse positioning adjustment for large displacements and fine adjustment that allows positioning to approximately 0.02 μm (0.8 μin). They have enough measuring range to calibrate nearly all extensometers and the resolution necessary to calibrate extensometers with low measuring ranges.

A Touch Display digital readout and software for a PC are included. The calibrator can be used with either or both. The Touch Display and software both provide readouts in millimeters, inches or % strain and have tap-to-zero or click-to-zero functions. The digital displays can reduce operator errors compared to calibrators with mechanical vernier scales.

A wide range of adapters are available to allow use with axial, transverse, shear, and many other specialized extensometers. The calibrator comes with round adapters (9.52 mm [0.375 inches] diameter) that work with many typical axial extensometers. Specialized adapters are available. For very long gauge length extensometers, optional extension posts are available. Contact Epsilon for a configuration that is an exact match for your extensometer.

Download Data Sheet

  • Scale calibration traceable to NIST.
  • System fully calibrated traceable to NPL (UK standards organization).
  • Touch Display with digital readout is included:
    • Digital readout in units of mm, µm, inches, µin or % strain
    • Remaining travel indicator assists with extensometer setup
    • Includes USB interface for PC software
    • Includes tabletop stand
    • Optional temperature and humidity sensor
    • Requires a USB power source such as a PC
  • Software for Windows-based PC is included:
    • Digital readout in units of mm, inches or % strain
    • Readings taken with the software may be saved to a data file
    • Requires PC with Windows 7/10 and a USB port
  • Wide range of extensometer adapters available.
  • Provided with a foam-lined storage case.

Download Data Sheet

Measuring Range: 50 mm (2 inch) maximum displacement

Maximum Clearance: suitable for calibrating extensometers with GL+MR <125 mm*; example: 3542-050M-100, 50 mm GL + 50 mm MR = 100 mm clearance required

Accuracy: better than: ±0.2 μm [0-0.12 mm], ±0.16̅% [0.12-0.60 mm], ±1.0 μm [0.6-5.0 mm], ±0.02% of value [5.0-25mm], ±5μm max [>25mm] – click for technical details

Accuracy Class: better than ISO 9513 class 0,5 requirements for verification apparatus for all extensometer gauge lengths, and ASTM E83 class B-1 requirements for verification apparatus for extensometers with gauge lengths ≥6 mm; both classes apply 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; includes USB cable; requires 5W min. power via USB-A connector from a computer or power adapter (not included)

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

Adapters: includes Ø9.52 mm (0.375 inch) adapters for extensometer attachment*

EMC Compliance: BS EN 61326-1: 2006

* A range of extension columns and extensometer adapters are available – contact Epsilon
** Recommended range



Download Data Sheet

Optional extensometer adapter sets, extension columns, and calibrator kits for transverse extensometers:
3590-01 Smooth, round 6.35 mm (0.25 inch) diameter adapters
3590-02 Flat adapters
3590-3549 Mounting bracket for Model 3549
3590-3648 Mounting bracket for Model 3648
3590-03 Adapters for fracture mechanics gages, for example Models 3541 and 7641
3590-3548 Mounting bracket for Model 3548COD (requires 3590-03 adapters)
3590-11 Transverse extensometer adapters for Models 3575, 3475, 3575AVG, 3580, 3565, 3544, 3911 & 3975 (not suitable for 3560BIA); for customers who already have 3590-04-KIT or 3590-11-KIT
3590-11-KIT Calibrator conversion kit for transverse extensometers – consists of legs to configure the calibrator in a horizontal orientation, additional springs, and transverse extensometer adapters for Models 3575, 3475, 3575AVG, 3580, 3565, 3544, 3911 & 3975 (not suitable for 3560BIA); enables verification of transverse extensometers in the orientation that will be used for testing, as required by some calibration and verification standards
3590-3580 Mounting bracket for Model 3580 transverse extensometer (includes 3590-11 adapters)
3590-04 Transverse extensometer adapters for Model 3560BIA; for customers who already have 3590-04-KIT or 3590-11-KIT
3590-04-KIT Calibrator conversion kit for Model 3560BIA – consists of legs for horizontal configuration, additional springs, and 3590-04 adapters; enables verification of Model 3560BIA 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)
3590-08 Adapters for Models 3910 and 3909
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

Optional temperature and humidity sensor for the Touch Display

Download Data Sheet

Product Videos

Digital extensometer calibrator with software position readout (included Touch Display digital readout not shown)

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”,, making the Standards Labs effectively equivalent and traceable to each other. This includes NIST in the USA, the NPL in the UK and many others. 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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