extensometer

extensometer (plural extensometers)

1. An electromechanical device for measuring changes in length of an object undergoing stress.
   • 2022 October 5, Tom Allett, “HS2's green screen to aid the environment”, in RAIL, number 967, page 35:

     For the ground, that means using three primary types of equipment:
     ■ Extensometers to look for ground heave - the upwards movement of soil, which can occur at any stage. It is essentially the opposite of erosion and is often associated with clay-type soils which swell when wet.
     ■ Inclinometers, which measure slope movements.
     ■ Piezometers to measure water levels.

• extensimetric
• extensimetry
• extensometry