Axial-Torsional Digital Electronic Calibrators – Model 3590AT

Epsilon’s axial/torsional calibrator features 0.001 mm (50 microinches) resolution, and has 50 mm (2 inches) of measuring range axial and torsional rotation where 1.27 mm (0.050 inch) of linear motion equates to 1° angle of twist. The autozero button and digital display greatly simplify calibration of extensometers. The 3590AT calibrator is designed to be used with the Model 3550, 7650, and 3550HT axial/torsional extensometers.

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 digital display reads mm and changes to inches at the touch of a button. The autozero button is a great help in calibrating. Just press the button to start readings from zero. The digital display reduces operator error.

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  • 0.001 mm (50 microinches) resolution.
  • ±0.004 mm/25 mm (±0.00015 in/in) accuracy.
  • 50 mm (2 inches) axial measuring range.
  • Torsional 10 degree measuring range.
  • Digital display.
  • Autozero button simplifies readings.
  • Foam lined case for storage included.
  • System fully calibrated traceable to NPL (UK standards organization).

Download Data Sheet

Options For Available Adapter Sets

The 3590AT can be converted into a standard Model 3590 calibrator with the optional 3590AT-3590 adapter.


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With epsilon’s in-house laser interferometer system, the full calibrator systems can be calibrated traceable to NPL. No longer do customers have to rely on micrometer head only or potentially error-prone gauge block calibrations for full system calibrations.

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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Our 2022 Extensometer Catalog, Version 110 is now available! Not finding something you’re looking for? Ask us about a custom quote.