Designed for measuring R-values in sheet metal testing. This Extensometer averages the lateral strain at two locations. 

The Model 3575AVG Extensometers are strain gauged devices. making them compatible with any electronics designed for strain gauged transducers. Features: May be left on through specimen failure. Full bridge, 350 ohm strain gauged design for compatibility with nearly any test system. Meets ASTM E-83 class B-1 and ISO 9513 class 0.5 requirements for accuracy.

Measuring range: 0.075 inches or 2mm (specify). Single clip-on unit directly measures lateral strain as n average of two locations.