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Answer for the clue "A measuring instrument that measures the hardness of materials by penetrating them with a stylus that has a diamond point ", 11 letters:
sclerometer

Word definitions for sclerometer in dictionaries

Wikipedia Word definitions in Wikipedia
The sclerometer , also known as the Turner-sclerometer (from meaning "hard"), is an instrument used by metallurgists , material scientists and mineralogists to measure the scratch hardness of materials. It was invented in 1896 by Thomas Turner (1861–1951), ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Sclerometer \Scle*rom"e*ter\, n. [Gr. sklhro`s hard + -meter.] An instrument for determining with accuracy the degree of hardness of a mineral.

WordNet Word definitions in WordNet
n. a measuring instrument that measures the hardness of materials by penetrating them with a stylus that has a diamond point

Wiktionary Word definitions in Wiktionary
n. A device used to measure the hardness of a material by applying pressure to a moving diamond stylus.