Epsilon Technology Corp.
Extensometers for strain measurement in materials testing. An extensometer for every need. Over 30 models of extensometers, COD gages, deflection gages or deflectometers and related devices.
http://www.epsilontech.com/

Roctest Ltd
Roctest manufacturer offers measuring instruments : extensometer, piezometer, jointmeter fiber optic sensor, convergencemeter, strain gage, vibrating wire, inclinometer casing and probe, settlement system and dilatometer.
http://www.roctest.com/

Electronic Instrument Research
Manufacturer of Laser Extensometers specifically designed for accurate, non-contact measurement of strain on various materials under tensile or compressive conditions.
http://www.e-i-r.com/

Precision Measurement Company
Manufactures of Pressure Transducers - Miniature Series, Load Cells - Miniature Series, and Extensometers for material testing. Our company has been serving industry, academic institutions and research laboratories for over 30 years. Typical applications include pressure measurements in biomedical studies, fluid or gel pressures in small confined regions, mold pressures in plastic or rubber and measurements of contact pressure between two solids. All transducers are fully calibrated and calibration data is furnished with each individual instrument. All of our instruments are strain gage based designs, giving the advantage of proven technology, reasonable cost, and good performance under both static and dynamic conditions.
http://www.pmctransducers.com/

Mine Design Technologies
Manufacturers of instrumented "SMART" cable bolts and multipoint borehole extensometers for the geotechnical industries.
http://www.mdt.ca/

Geotechnical Instrumentation
RST Instruments offers a full range of geotechnical and structural instrumentation for investigating and monitoring a wide range of projects in the civil engineering, mining, & environmental sectors.
http://www.rstinstruments.com/

Testing Calibration Services
The calibration of materials testing machines. Calibration of tensile and compression testing machines, push pull reading devices. Long travel extensometers calibrated to the UKAS standards.
http://www.tcslab.co.uk