High-precision optical extensometers with industry-leading resolution, accuracy, speed, and ease of use. Measures axial strain and elongation for a wide range of applications. ±10V output is compatible with any testing system.
Gauge Lengths: User selectable, small as 2 mm Measuring Ranges: <1% to >1000%, depending on gauge length and field of view Field of View: 52 - 500 mm Key Features: Non-contacting, high precision, high speed, telecentric optics, Instant Reset, Always On / Always Running, laser alignment, ±10V output
➜ Features and specifications ➜ Applications ➜ Advantages
These extensometers are high precision non-contacting units for strain measurement in materials testing. They use a high speed laser scanner to measure the spacing between reflective tape strips on the sample. The measurement range is 8 to 127 mm (0.3 to 5 inches).
Gauge Lengths: User selectable Measuring Ranges: User selectable Temperature Range: Ambient to 425 °C Key Features: Non-contacting
General purpose extensometers for axial tensile, compression, and cyclic testing. Gauge lengths from 20 to 80 mm (and 0.8 to 2 inches) and full scale measuring ranges from 5% to 100% strain.
Gauge Lengths: 20 – 80 mm Measuring Ranges: 5% – 100% Temperature Range: -270 °C to 200 °C with LHT option Key Features: Quick attach, adapter kits to change gauge lengths
Small profile and ultra-light weight, these units are appropriate for testing small and delicate samples yet rugged enough for daily use on standard specimens. Ideal for wire specimens, sheet materials, and standard ASTM or ISO specimen geometries, and excellent for low and high cycle fatigue testing.
Gauge Lengths: 3 – 50 mm Measuring Ranges: 5% – 100% Temperature Range: -270 °C to 200 °C with -LHT option Key Features: Low profile, light weight, adapter kits to change gauge lengths
Long gauge length extensometers with gauge lengths 100 mm (4 inches) or greater for tensile and compression testing. These units are for long gage length applications where low level strain measurements such as offset yield are required.
Gauge Lengths: 100 – 600 mm Measuring Ranges: ±2.5 mm up to +25.0 mm/-6.0 mm Temperature Range: -270 °C to 200 °C with LHT option Key Features: Extra-long gauge length
This model is available in gauge lengths from 50 mm (2 inches) and larger, with measuring ranges up to 100 mm (4 inches). It is a uniquely designed unit that may be left on through specimen failure. These extensometers are widely used where long samples are required. They are ideal for testing steel re-bar, weld joints, and wire materials.
Gauge Lengths: 50 – 600 mm Measuring Ranges: +25 mm, +50 mm, +100 mm Temperature Range: 1 °C to 150 °C with -HT1 option Key Features: Large gauge length, rugged, rebar testing
Measures strain on opposite sides of the specimen and outputs the average. Features self-setting gauge length.
Gauge Lengths: 10 – 50 mm Measuring Ranges: ±0.5 mm, ±1.0 mm, +2.5 mm Temperature Range: -270 °C to 200 °C with -LHT option Key Features: Self-setting gauge length, compact
Designed for plastics, rubber and elastomer testing, these extensometers have very long measuring ranges. Their unique design allows testing to failure and minimizes interaction with the sample.
Gauge Lengths: 20 – 50 mm Measuring Ranges: +250 mm and +500 mm Temperature Range: -40 °C to 100 °C Key Features: High elongation extensometer
Designed for tensile testing with furnaces, these extensometers use Epsilon’s self-supporting design and do not require cooling or mounting brackets.
Gauge Lengths: 10 – 50 mm Measuring Ranges: 5% – 100% Temperature Range: Ambient to 1200 °C Key Features: Self-supporting furnace extensometer
This model can be connected to the test sample in a few seconds. With very low sensitivity to vibrations, this hot mountable unit is ideal for the demanding requirements of strain controlled, elevated temperature axial testing and other common test methods.
Gauge Lengths: 10 – 50 mm Measuring Ranges: 10% – 100% Temperature Range: Ambient to 1600 °C with -HT option Key Features: Hot-mountable furnace extensometer
High precision extensometer measures axial strains on specimens at temperatures up to 1600 °C (2900 °F). Compatible with materials testing furnaces or induction heating. May be used for strain-controlled, high frequency fatigue tests. Slide mounting system enables mounting to hot specimens in seconds.
Gauge Lengths: 12.5 – 25 mm Measuring Ranges: +2.5 mm / -0.5 mm typical Temperature Range: Ambient to 1600 °C with -HT option Key Features: Hot-mountable, extended performance furnace extensometer
For use in environmental chambers where the entire extensometer must be exposed to elevated temperatures. These capacitive extensometers may be used up to 700 °C (1300 °F) without any cooling.
Gauge Lengths: 10 – 50 mm Measuring Ranges: 2.5 mm to 12.5 mm Temperature Range: Ambient to 700 °C Key Features: Uncooled axial extensometer for environmental chambers
For fracture mechanics studies, these COD gages are in compliance with standardized test methods, such as ASTM E1820 for determination of fracture toughness properties of metallic materials.
Gauge Lengths: 3 – 20 mm Measuring Ranges: 2.5 mm - 12.5 mm Temperature Range: -270 °C to 200 °C with -LHT option Key Features: ASTM E399 and E1820 versions available; some models may be used for da/dN at 50 Hz or more
High temperature COD gages for use in split type materials testing furnaces with a slot for the ceramic rods. Liquid-cooled and bracket mounted, these COD gages are for use to 1200 °C (2200 °F). The high temperature option allows use to 1600 °C (2900 °F). They are specifically designed for fracture mechanics testing.
Gauge Lengths: 5 – 20 mm Measuring Ranges: 2.5 mm – 12.5 mm Temperature Range: Ambient to 1600 °C Key Features: Furnace COD gage
Designed for fracture mechanics testing in environmental chambers where the entire gage must be exposed to elevated temperatures. These capacitive sensors may be used up to 700 °C (1300 °F) without any cooling.
Gauge Lengths: 3 – 12 mm Measuring Ranges: 2.5 mm to 12.5 mm Temperature Range: Ambient to 700 °C Key Features: Uncooled COD gage for environmental chambers
Widely used for measuring deformations in three and four point bend tests, compression tests and a variety of general purpose deformations. These strain gaged devices come with a magnetic base for easy mounting.
Measuring Ranges: 1 – 50 mm Temperature Range: -270 °C to 200 °C with -LHT option Key Features: High sensitivity deflection measurement on any flat surface
Designed for general purpose transverse or diametral strain measurement on axially loaded specimens. This model may be used simultaneously with the Model 3542 axial extensometer.
Specimen Size: Up to 25 mm width or diameter Measuring Ranges: ±0.5 mm to ±5.0 mm Temperature Range: -270 °C to 200 °C with -LHT option Key Features: Durability, easy mounting
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.
Specimen Size: Up to 25 mm width or diameter Measuring Ranges: ±0.25 mm to ±1.25 mm Temperature Range: -270 °C to 200 °C with -LHT option Key Features: Low profile, durability, light weight
A single integral unit provides simultaneous lateral (transverse) strain and axial strain measurements.
Gauge Lengths: 10 – 50 mm Measuring Ranges: ±5% and ±10% axial; ±1.0 mm transverse Temperature Range: -270 °C to 200 °C with -LHT option Key Features: Averaged axial and averaged transverse measurements; measures Poisson’s ratio with the average of two measurements
For transverse or diametral strain measurements at temperatures to 1000 °C (1832 °F). These extensometers may be used with furnaces having a side entry slot for an extensometer or with induction heating systems. They utilize a proprietary, rugged dual flexure design.
Specimen Size: Customizable Measuring Ranges: 0.5 mm – 5.0 mm Temperature Range: Ambient to 1600 °C Key Features: Diametral extensometer for furnaces
Designed for transverse or diametral strain measurement in environmental chambers where the entire extensometer must be exposed to elevated temperatures. These capacitive extensometers may be used up to 700 °C (1300 °F) without any cooling.
Specimen Size: Up to 25 mm width or diameter Measuring Ranges: ±1.2 mm to ±2.5 mm Temperature Range: Ambient to 700 °C Key Features: Uncooled transverse extensometer for environmental chambers
Designed primarily for compressive strength tests on rock, concrete and other large compression samples, this model measures axial strain on opposite sides of the test specimen, and the output is an average of the two readings.
Gauge Lengths: 25 – 200 mm Measuring Ranges: ±1.2 mm to ±6.0 mm Temperature Range: -270 °C to 200 °C with -LHT option Key Features: Averaging axial rock/concrete extensometer
With gauge lengths of 1 and 2 inches (25 and 50 mm) and measuring ranges of 0.050 and 0.100 inches (1.2 and 2.5 mm), the Model 3442RA1 was designed for applications where tensile or compressive strength tests on small rock, concrete and other small compression samples is desired.
Gauge Lengths: 25 – 50 mm Measuring Ranges: ±1.25 mm and ±2.5 mm Temperature Range: -270 °C to 200 °C with -LHT option Key Features: Miniature averaging axial rock/concrete extensometer
Designed for concrete and rock compression testing or for compression tests on other large samples. This model may be used simultaneously with the Model 3542RA axial extensometers.
Gauge Lengths: 50 – 200 mm Measuring Ranges: 2 mm to 12 mm Temperature Range: -40 °C to 200 °C with -HT2 option Key Features: Circumferential
Designed for measuring axial displacements in the simple performance tests prescribed by NCHRP Report 465, and determining dynamic modulus of hot mix asphalt per AASHTO TP062.
Gauge Lengths: 70 – 100 mm Measuring Ranges: ±0.5 mm Temperature Range: -270 °C to 200 °C with -LHT option Key Features: Magnetic mounting on gauge points adhered to the specimen
Designed to many of the needs for testing asphalt core samples in 4 and 6 inch diameters. The unit meets test method requirements for strain measurement developed under the U.S. Federal Highways SHRP program
Gauge Lengths: 25 – 100 mm Measuring Ranges: ±0.5 mm Temperature Range: -270 °C to 200 °C with -LHT option Key Features: Biaxial deformation measurement (lateral and vertical)
Designed to meet many of the needs for testing asphalt core samples in 4 and 6 inch diameters. It meets test method requirements for strain measurement developed under the U.S. Federal Highways SHRP program.
Specimen Size: 100 mm and 150 mm Measuring Range: 0.76 mm to 2.0 mm Temperature Range: -270 °C to 200 °C with -LHT option Key Features:Indirect tensile testing of asphalt
Designed for accurate measurement of small diametral strains such as those required to determine Poisson’s ratio of rock, concrete and asphalt samples. The units are designed to be used in conjunction with the Model 3542RA axial averaging extensometer.
Specimen Size: Customizable Measuring Ranges: 0.76 mm to 2.0 mm Temperature Range: -270 °C to 200 °C with -LHT option Key Features: Diametral
Designed for simultaneously measuring axial and torsional deflections on specimens tested in axial/torsional machines.
Gauge Lengths: 10 – 25 mm Measuring Ranges: 5% and 10% axial; Up to 2.5° torsional Temperature Range: -270 °C to 200 °C with -LHT option Key Features: Axial-torsional
Simultaneously measures axial and torsional strains at high temperatures on specimens tested in axial/torsional machines. For use with materials testing furnaces or induction heating up to 1600 °C (2900 °F). May be used for bi-axial strain controlled fatigue. Slide mounting system enables mounting to hot specimens in seconds.
Gauge Lengths: 12.5 – 25 mm Measuring Ranges: +2.5 mm / -0.5 mm axial and ±2° torsional typical Temperature Range: Ambient to 1600 °C with -HT option Key Features: Hot-mountable, axial-torsional furnace extensometer
Simultaneously measures in-plane bi-axial strains at high temperatures on specimens tested in X-Y bi-axial machines. For use with materials testing furnaces or induction heating up to 1600 °C (2900 °F). May be used for bi-axial strain controlled fatigue. Slide mounting system enables mounting to hot specimens in seconds.
Gauge Lengths: 12.5 – 25 mm Measuring Ranges: +2.5 mm / -0.5 mm typical Temperature Range: Ambient to 1600 °C with -HT option Key Features: Hot-mountable, XY planar biaxial furnace extensometer
Designed for measuring small measuring strain ranges as required for proof load testing of bolts and similar applications such as yield measurement.
Gauge Lengths: 25 – 150 mm (plus optional extensions) Measuring Ranges: 1.25 mm Temperature Range: -270 °C to 200 °C with LHT option Key Features: Bolt proof testing
Extensometers for measuring elongation of rebar coupler, splice, and sleeve assemblies. Use for tension, cyclic, slip, and differential elongation tests.
Gauge Lengths: 95 – 975 mm Measuring Ranges: +12.5 mm Temperature Range: -40 °C to 100 °C Key Features: Rebar coupler / splice extensometer
Designed specifically for performing tests in accordance with ASTM D5656, Standard Test Method for Thick-Adherend Metal Lap-Shear Joints for Determination of the Stress-Strain Behavior of Adhesives in Shear by Tension Loading. The deformation is measured on opposite sides of the test specimen and the output is an average of the two readings.
Measuring Ranges: 0.5 mm to 3.0 mm Temperature Range: -270 °C to 200 °C with -LHT option Key Features: D5656 adhesive lap shear test
For measuring shear properties of sandwich cores to ASTM C273. Simple clip-on design attaches in seconds and provides repeatable test results.
Measuring Ranges: ±5 mm shear displacement Temperature Range: -270 °C to 200 °C with -LHT option Key Features: Sandwich core shear and rigid cellular plastic shear
Submersible extensometers designed for testing in water, saline solutions, and other liquids compatible with the materials of construction.
Gauge Lengths: 10 – 25 mm Measuring Ranges: ≤5 mm Temperature Range: -40 °C to 100 °C Key Features: Submersible
The SGA series signal conditioners are ideal for cyclic and high speed testing where no display is needed. Available in single and dual channel versions, they provide the signal conditioning electronics needed for a strain gage based extensometer.
The DSCUSB provides USB plug-and-play capability to any strain gauged extensometer. They are useful when you wish to acquire data directly to your computer without the need for a controller.
Epsilon’s very high resolution calibrator features 20 nanometers (0.8 microinches) resolution and has 50 mm (2 inches) of measuring range. The 3590VHR is provided with a Touch Display digital readout and software to display the calibrator readings on a computer. The 3590VHR calibrator meets the accuracy and resolution requirements for ASTM E83 Class B-1 for a 6 mm gauge length and greater extensometers and ISO 9513 Class 0,5 over the full measuring range of the calibrator.
Epsilon’s standard calibrator features 0.001 mm (50 microinches) resolution and has 50 mm (2 inches) of measuring range. The autozero button and digital display greatly simplify calibration of extensometers. The 3590 calibrator is useful for extensometer calibration and verification with test systems.
Epsilon’s torsional calibrator accessory can be attached to model 3590VHR and 3590 calibrators to perform calibrations of model 3550 and 7650 axial/torsional extensometers. The torsion accessory's linear displacement head has 0.001 mm (50 microinches) of resolution, where 1.27 mm (0.050 inch) of linear motion equates to 1° angle of twist.
Designed to allow Epsilon’s extensometer calibration to be easily transferred to a customer’s electronics, the Epsilon Shunt Calibration System is available for any strain-gaged extensometer.
10V calibration reference for high level devices.
