extensometer
/ˌɛkstɛnˈsɑmɪtər/
noun
- A device used to measure small changes in the length of an object, especially to test how materials stretch under stress.
- The bridge's safety was monitored with extensometers that detected any tiny deformations in the metal supports.
- In the lab, we used an extensometer to check the elasticity of the rubber sample.
- The engineer attached an extensometer to the steel beam to measure how much it stretched under the heavy load.