extensometer
nounUK /ˌɛkstɛnˈsɒmɪtə/
US /ˌɛkstɛnˈsɑːmɪtər/
A tool that measures how much something stretches or gets longer.
The engineer used an extensometer to check how much the metal bar stretched under the heavy load.
RELATED WORDS
OTHER MEANINGS
2. A device used in materials testing to record the extension of a specimen as it is pulled.
During the tensile test, the extensometer recorded the sample's extension until it broke.
3. An instrument attached to a structure to monitor tiny changes in length over time.
Sensors and extensometers were mounted on the bridge to watch for slow stretching.
4. A laboratory gauge that measures the strain of a material under load.
The lab technician calibrated the extensometer before measuring the strain in the concrete sample.