Phone: 719.694.8040
Fax:   888.809.3867




Our model ETG transverse / diametral extensometer is designed for general purpose measurement of transverse or diametral strain on axially loaded specimens. It may also be simultaneously used with a Model EAG axial extensometer for measurement of Possion's ratio (per ASTM E132) and sheet metal testing such as r-value.

Model ETG is designed to be self-supported and can be used on any width or diameter specimen from 0 to 32 mm (0 to 1.250"). Designed around our innovative, cross-flexure module, this extensometer is designed for improved performance and ruggedness. It features a side-exit cable to reduce cable wear and damage.

With a full bridge, 350 ohm, strain gaged design, model ETG is compatible with most test systems and signal conditioning electronics design for strain gage based transducers. Reliant can provide stand-alone electronics to allow the use of data acquisition boards (DAQ), chart recorders or other test equipment.


  • May be left on through specimen failure.
  • 350 ohm, full bridge strain gaged design to ensure compatibility with most any test system.
  • Designed to measure in both tension and compression and can be used for cyclic testing.
  • Built-in mechanical over-travel stops provide protection in both directions.
  • May be used simultaneously with a Model EAG axial extensometer for measurement of Possion's ratio (per ASTM E132) and sheet metal testing such as r-value.
  • Rugged, optimized, dual flexure design for strength and improved performance.
  • Replaceable, tool steel knife edges and all units are shipped with a spare set.
  • Self-supporting on the specimen.
  • High and low temperature options extend operation range from -270°C to +200 °C (-454 °F to +400 °F).
  • Connectors to interface to most any brand of test equipment.
  • Stand alone signal conditioners for use with DAQ boards.
  • High-Toughness, and specialty knife edges.

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

Output: 2 to 4 mV/V, nominal.

Linearity: ≤0.15% of full scale measuring range.

Standard Temp. Range: -40 °C to +100 °C (-40 °F to 210 °F) (optional temperature ranges available)

Cable: Standard 2.5 m (8 ft), ultra-flexible cable.

Quick Attach System: Fits round samples up to 32 mm (1.250") diameter and flats samples up to 32 mm (1.250") wide.

If you have any questions, please call or click request button below.

Transverse / Diametral Extensometer - Model ETG

General purpose, strain gauge based extensometers for measurement of transverse / diametral strain in an axial loaded specimen. Can be used simultaneously with a model EAG for Poisson's ratio testing. Full scale measuring ranges from ±1 mm to ±5 mm (±0.050" to ±0.200") and temperature ranges from -270 °C to 200 °C.

Robust, Cross-Flexure Design

optimized for high linearity, performance, and ruggedness


ASTM E132 and r-Value Tests

designed and verified to meet current standards


Over 10 Years Serving the Industry

we will be there with service and support when you need it


Our model ETG transverse / diametral extensometer is built with a modular design. This allows us to supply the exact measuring range and temperature range required for your test. May be used for tensile, compression, and cyclic testing. Please contact us if your particular configuration is not listed.

Ordering Information: Model ETG-____-_
Measuring Range:
Temperature Range:


020M = 2 mm

025M = 2.5 mm

030M = 3 mm

050M = 5 mm

0075 = 0.075"

0100 = 0.100"

0150 = 0.150"

0200 = 0.200"

S = -40 °C to +100 °C

L = -270 °C to +100 °C

H = -40 °C to +200 °C

X = -270 °C to +200 °C

Model ETG is available in almost any configuration of measuring range and temperature range listed above. Other configurations are available; please contact Reliant with your requirements.

Example: ETG-020M-S

(±2 mm measuring range and standard temperature option)

Reliant Technology LLC.

2334 E Boulder Street

Colorado Springs, CO 80909 USA


Questions or Repair?

If you have any questions or would like a quote, please contact us HERE.

If your extensometer is in need of service or repair, please fill out an RMA form HERE.