sclerometer

An instrument used to determine the relative hardness of a material by measuring the pressure required to penetrate the material with a standard diamond stylus.

An instrument for determining with precision the degree of hardness of a mineral.

An instrument for determining with accuracy the degree of hardness of a mineral.

A device used to measure the hardness of a material by applying pressure to a moving diamond stylus

a measuring instrument that measures the hardness of materials by penetrating them with a stylus that has a diamond point