Miniature Transverse (Diametral) Extensometers – Model 3475

A miniature extensometer designed for general purpose transverse or diametral strain measurements on small or thin specimens. May be used simultaneously with the Model 3442 miniature axial extensometers or the Model 3542 axial extensometers.

Epsilon extensometers are COMPATIBLE WITH VIRTUALLY EVERY BRAND OF TEST EQUIPMENT and can be supplied with the correct connector to plug in directly, or supplied with a separate conditioner and amplifier.

WITH EPSILON’S 20+ YEAR HISTORY OF SERVICE to the materials testing community, you know we will be there to stand behind our products when your critical application requires it.

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.

These very lightweight extensometers are self-supporting on the test sample. They are used for measuring transverse or diametral strain. Often they are used simultaneously with an Epsilon axial extensometer, and together these extensometers are suitable for measuring Poisson’s ratio per ASTM E132 with most materials and specimens. They are also used for characterizing materials with anisotropic properties, such as with many composite materials.

This model clips easily onto the sample with an integral spring to hold the unit in place. It can be adjusted to work on any size sample from 0 to 25 mm (0-1 inch) width or diameter. The Model 3475 has an arm thickness of only 3.81 mm (0.15 inches), and will work simultaneously with any axial extensometer having sufficient clearance between arms (not all versions of the 3442 miniature extensometer can be used). Large radius contacts prevent the unit from digging into the samples. This model utilizes Epsilon’s dual flexure design, allowing use in dynamic applications. All units have measuring ranges in both directions.

The Model 3475 extensometers are strain gaged devices, making them compatible with any electronics designed for strain gaged transducers. Most often they are connected to a test machine controller. The signal conditioning electronics for the extensometer is typically included with the test machine controller or may often be added. In this case the extensometer is shipped with the proper connector and wiring to plug directly into the electronics. For systems lacking the required electronics, Epsilon can provide a variety of solutions, allowing the extensometer output to be connected to data acquisition boards, chart recorders or other equipment.

Download Data Sheet

  • May be left on through specimen failure.
  • Full bridge, 350 ohm strain gaged design for compatibility with nearly any test system.
  • All models will measure both positive and negative displacements.
  • Easy to mount, with integral springs to keep the extensometer on the sample.
  • Self-supporting on the specimen.
  • All standard units have linearity readings of 0.20% or better.
  • Includes the Epsilon Shunt Calibration System for on-site electrical calibration.
  • Rugged, dual flexure design for strength and improved performance. Much stronger than single flexure designs, this also allows cyclic testing at higher frequencies.
  • Includes high quality foam lined case.

Download Data Sheet

Excitation: 5 to 10 VDC recommended, 12 VDC or VAC max.

Output: 2 to 4 mV/V, nominal, depending on model

Linearity: ≤0.20% of full scale measuring range

Temperature Range: Standard (-ST) is -40 °C to +100 °C (-40 °F to 210°F)

Cable: Integral, ultra-flexible cable, 2.5 m (8 ft) standard

Specimen Size: Works with samples up to 25 mm (1 inch) width or diameter



Download Data Sheet

  • Connectors to interface to nearly any brand of test equipment

Download Data Sheet

Ordering Information

Click table options to configure

Measuring Range i
mm or inches #
±0.25 mm -025M 025M
±0.50 mm -050M 050M
±1.00 mm -100M 100M
±1.25 mm -125M 125M
±0.010 in -010T 010T
±0.020 in -020T  020T
±0.040 in -040T 040T
±0.050 in -050T 050T
Temperature Range
degrees #
-270 ˚C to 100 ˚C (-454 ˚F to 210 ˚F) -LT LT
-40 ˚C to 100 ˚C (-40 ˚F to 210 ˚F) -ST ST
-40 ˚C to 150 ˚C (-40 ˚F to 300 ˚F) -HT1 HT1
-40 ˚C to 200 ˚C (-40 ˚F to 400 ˚F) -HT2 HT2
-270 ˚C to 200 ˚C (-454 ˚F to 400 ˚F) -LHT LHT
Model Number:  3475_ _ _ __ _ _
Model Number:
3475_ _ _ __ _ _
Model 3475 Available Versions: ANY combination of measuring range and temperature range listed above is available. Other configurations may be available with special order; please contact Epsilon to discuss your requirements.
Example: 3475-050M-LT: ±0.50 mm measuring range, low temperature option (-270 °C to 100 °C)


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.