Phone: 719.694.8040
Fax:   888.809.3867




Our model EAH high elongation axial extensometer is designed for the very long measuring ranges found in testing plastics, rubber and elastomers. Designed to minimize any influence on the test specimen while testing to specimen failure this model remains stationary during the test and only the small and light weight traveling heads move with the specimen as it elongates.

Unlike most of our extensometers, Model EAH utilizes a set of high performance, hybrid potentiometers to complete a full bridge configuration. As such, the output of this model can be made to output a high level signal (2 to 5 VDC) or mimic a strain gaged transducer (2 to 4 mV/V).

When configured for low level output, model EAH is compatible with most test systems and signal conditioning electronics designed for strain gage based transducers.

If configured with a high level output, model EAH can be directly connected to a data acquisition board (DAQ), chart recorder or other test equipment.

  • May be left on through specimen failure.
  • Can be configured for use with most any test system or data acquisition boards / chart recorders.
  • May be used for testing to ASTM D412 standards.
  • Shipped with a fine-adjustment, magnetic base for easy mounting and adjustment.
  • Connectors to interface to nearly any brand of test equipment.
  • Gauge length adapter kits.
  • Stand alone signal conditioners for use with DAQ boards.

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

Output: 2 to 5 VDC high level or 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)

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

Operating Force: Typically less than 25 g.

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

High Elongation Axial Extensometer - Model EAH

Long measuring range, axial extensometers for testing plastic, rubber, elastomers and other long elongation materials to specimen failure. Gauge lengths from 25 mm to 100 mm (1.000" to 4.000") and full scale measuring ranges from 125 mm to 500 mm (5" to 20").

Robust, Easy to Use  Design

optimized for high linearity, performance, and ruggedness



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 EAH high elongation axial extensometer is built with a modular design. This allows us to supply the exact gauge length and measuring range required for your test. Please contact us if your particular configuration is not listed.

Ordering Information: Model EAH-____-____
Gauge Length:
Measuring Range:


025M = 25 mm

050M = 50 mm

100M = 100 mm

0100 = 1.000 in

0140 = 1.400 in

0200 = 2.000 in

0400 = 4.000 in

125M = 125 mm

250M = 250 mm

500M = 500 mm

0500 = 5.000"

1000 = 10.000"

2000 = 20.000"

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

Example: EAH-025M-125M

(25 mm gauge length and 125 mm measuring range)

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.