Extensometers measure strain, the change in length of a specimen divided by the original length
(gauge length) of the specimen. An extensometer measures strain by means of knife edges which contact the sample. This series of extensometer comprises strain gaged devices
The models in this series of extensometer can be used to measure either longitudinal or transverse strain, or can be used in combination for determining ‘r’-value and Poisson’s ratio.
Key advantages of using strain gage type extensometers are as follows:
● Can be left on specimen through failure
● Lightweight to minimize any influence on the test
● Low operating force
● Rugged construction to withstand rigors of operation.