Phone: 719.694.8040
Fax:   888.809.3867




Model DG is our general purpose deflectometer / displacement gage. Commonly used for measuring deformation in three and four point bend tests, compression tests, and a variety of tests requiring general displacement measurement.

Similar to a machinist's test indicator, deflection is measured with spherical contact tip attached to a single, moveable arm. Featuring a full bridge strain gaged construction, model DG provides an electrical signal compatible with most test systems and any electronics designed for a strain gaged transducer.

Designed around our innovative and rugged crossed-flexure module, this displacement gage also features a spring loaded break-away arm to protect it from accidental damage. The contact point exerts a small spring force against the surface being measured sufficient for dynamic / cyclic testing, yet low enough to avoid undue influence on the specimen.

The standard configuration for the deflection gage is upright with the moveable arm measuring displacement in the downward direction. However, they can be configured to measure in any orientation. It may also be configured with the spring force applied in the opposite direction.

With a full bridge, 350 ohm, strain gaged design, model DG 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 used through specimen failure.
  • 350 ohm, full bridge strain gaged design to ensure compatibility with most any test system.
  • Designed for general measurement of displacement and cyclic / dynamic testing.
  • Built-in mechanical over-travel stops provide protection in both directions.
  • Spring loaded contact arm designed to detach in an overtravel event to prevent damage.
  • Shipped with a fine-adjustment, magnetic base for easy mounting and adjustment.
  • Rugged, optimized, dual flexure design for strength and improved performance.
  • Meets ASTM E2309 and ISO 9513 standards.
  • High and low temperature options extend operation range from -270°C to +200 °C (-454 °F to +400 °F).
  • Connectors to interface to nearly any brand of test equipment.
  • Variety of contact tips available.
  • Custom mounting brackets for elevated temperature use.
  • Stand alone signal conditioners for use with DAQ boards.

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 Mounting System: Each unit ships with a high quality, central locking, magnetic base with fine adjustment for easy setup.

Operating Force: Typically less than 50 g.

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

Deflectometer - Model DG

General purpose deflection / displacement gages for measuring deformations in 3 and 4 point bend tests as well as compression tests and a variety of general purpose measurements of displacement.  Full scale measuring ranges from 2 mm to 50 mm (0.080" to 2.000") and temperature ranges from -270 °C to 200 °C.

Robust, Cross-Flexure Design

optimized for high linearity, performance, and ruggedness


ASTM E2309 and ISO 9513E83

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 DG general purpose deflectometer is built with a modular design. This allows us to supply the exact measuring range, and temperature range required for your test. It may also be configured with the spring force applied in the opposite direction.  Please contact us if your particular configuration is not listed.

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


              002M = 2 mm

              004M = 4 mm

              006M = 6 mm

              012M = 12 mm

              025M = 25 mm

              050M = 50 mm

              0080 = 0.080"

              0150 = 0.150"

              0250 = 0.250"

              0500 = 0.500"

              1000 = 1.000"

              2000 = 2.000"

    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 DG 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: DG-012M-S

(12 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.