tautometer
/ˈtɔːtəmɛtər/Definitions
1. noun
A device for measuring the tension in a wire, string, or other flexible material.
“The engineer used a tautometer to check the tightness of the guitar strings during the setup process.”
2. noun
An instrument for measuring the tension of a suspension or a spring.
“The physicist used a tautometer to measure the elasticity of a metal spring during the experiment.”