The Sclerometer, also known as the Turner-Sclerometer (from Ancient Greek: σκληρός meaning "hard"), is an instrument used by metallurgists, material scientists and mineralogists to measure the scratch hardness of materials. It was invented in year 1896 by Thomas Turner (1861–1951), the first Professor of metallurgy in Britain, at the University of Birmingham.
- Howe, Henry Marion (1916). The metallography of steel and cast iron. McGraw-Hill Book Company, Inc. p. 363.