This accurate capacitive high temperature extensometer measure and can control axial deflection and torsional strain with a single extensometer at high temperatures in combination with high temperature furnaces or induction heating systems.
The model 7650 extensometers are primarily used on round specimens tested in bi-axial test machines that are capable of simultaneous axial and torsional loading. All of the models are capable of bi-directional displacement in both axes and can be used for strain-controlled fatigue testing under completely reversed load and strain conditions at frequencies ranging up to 10 Hz.

These water cooled extensometers with its measurement system completely housed to reduce temperature disturbances by airflow minimize thermal drifts and provides accurate long-term stability.