sclerometer
/sklɪˈrɑmɪtər/
noun
- An instrument used to measure the hardness of a material, such as a mineral or metal.
- The geologist used a sclerometer to test the hardness of the rock sample.
- A simple sclerometer works by scratching the surface with a pointed tool under a known pressure.
- Engineers rely on a sclerometer to compare the durability of different alloys.