extensometers

/ˌɛkstɛnˈsɑmɪtərz/
noun
  1. Plural of extensometer; devices that measure small changes in length of objects.
    • Extensometers are essential tools for quality control in the manufacturing of cables and wires.
    • The researchers calibrated all the extensometers before starting the experiment.
    • The laboratory purchased several new extensometers for testing different types of metals.