Phone: 719.694.8040
Fax:   888.809.3867




Our model EDS clip-on gages is designed for testing to standards such as ASTM E1820 and E647. They are a general purpose COD gage designed for use in a variety of fracture mechanics tests (compact tension, bend specimens, and other standardized test methods) to determine fracture mechanics parameters such as R-curve, JIC, KIC, and fatigue crack growth rate (da/dN).

Configurations are also available to meet the requirements of ASTM E399 for fracture toughness. Model EDS is also designed to allow an optional side-exit cable. This can make installation easier for some set-ups such as bend specimen testing.

Model EDS clip-on gages are compatible with most any electronics designed for strain gaged based transducers. Connectors are available for most brands of test machine controls. If your system does not have a compatible strain channel, Reliant can provide stand-alone signal conditioners for use with data acquisition boards (DAQ) or chart recorders.


  • Full bridge, 350 ohm strain gaged design for compatibility with most any test system.
  • May be left on through specimen failure.
  • Fully enclosed with strong, CNC machined covers.
  • Optional side-exit cable for easier installation / use.
  • Meet ASTM E1820, ISO 12135, and ISO 9513 Class 1 requirements.
  • Optional configuration for ASTM E399 available.
  • Heat treated, stainless steel arms with sharp machined grooves improved stability and long service life.
  • High, low, and extended temperature options extend operation range from -270°C to +200 °C (-454 °F to +400 °F).
  • Pre-installed connector to interface to nearly any brand of test equipment.
  • Optional, side-exit cable for easier installation / use in some tests.
  • Bolt-on knife edge sets.
  • Stand alone signal conditioners for use with DAQ boards.
  • Special models available for other fracture mechanics testing.

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.  Also available with optional side-exit.

Operating Force: Typically 9 to 11 N (2 to 2.5 lbs).

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Clip-On Gages - Model EDS

General purpose, strain gauge based COD gages for fracture mechanics studies. Gauge lengths from 3 to 20 mm (0.100 to 0.500 inch), full scale measuring ranges from 2.5 to 12 mm (0.100 to 0.500 inch), and temperature ranges from -270 °C to 200 °C.

Compact, Robust Design

optimized for high linearity, performance, ruggedness, and ease of use


ASTM E1820, E399  and ISO 12135

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 EDS Clip-On Gages are built with a modular design. This allows us to supply the exact gauge length, measuring range, and temperature range required for your test. Models are available for ASTM E399 as well as special models for other fracture mechanics tests.  Please contact us if your particular configuration is not listed.

Ordering Information: Model EDS-____-____-_
Gauge Length:
Measuring Range:
Temperature Range:


    003M = 3 mm

    005M = 5 mm

    008M = 8 mm

    010M = 10 mm

    012M = 12 mm

    020M = 20 mm

    0100 = 0.100 in

    0200 = 0.200 in

    0300 = 0.300 in

    0400 = 0.400 in

    0475 = 0.475 in

    0500 = 0.500 in

     025M = +2.5 mm / -1 mm

     040M = +4 mm / -1 mm

     070M = +7 mm / -1 mm

     100M = +10 mm / -1 mm

     120M = +12 mm / -2 mm

     100T = +0.100" / -0.050"

     150T = +0.150" / -0.050"

     200T = +0.200" / -0.050"

     250T = +0.250" / -0.050"

     500T = +0.500" / -0.100"

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

Example: EDS-010M-004M-S

(10 mm gauge length, +10 mm / -1 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.