'Sclerometer' definitions:

Definition of 'sclerometer'

(from WordNet)
noun
A measuring instrument that measures the hardness of materials by penetrating them with a stylus that has a diamond point

Definition of 'Sclerometer'

From: GCIDE
  • Sclerometer \Scle*rom"e*ter\, n. [Gr. sklhro`s hard + -meter.] An instrument for determining with accuracy the degree of hardness of a mineral. [1913 Webster]