The sclerometer, also known as the Turner-sclerometer (from grc, σκληρός meaning "hard"), is an instrument used by

metallurgist Metallurgy is a domain of materials science and engineering that studies the physical and chemical behavior of metallic elements, their inter-metallic compounds, and their mixtures, which are known as alloys. Metallurgy encompasses both the sci ...

s, material scientists and

mineralogist Mineralogy is a subject of geology specializing in the scientific study of the chemistry, crystal structure, and physical (including optical) properties of minerals and mineralized artifacts. Specific studies within mineralogy include the proces ...

s to measure the

scratch hardness Scratch hardness refers to the hardness of a material in terms of resistance to scratches and abrasion by a harder material forcefully drawn over its surface. Scratch hardness test or scratch test refers to any of a number of methods of measuring s ...

of materials. It was invented in 1896 by Thomas Turner (1861–1951), the first Professor of

metallurgy Metallurgy is a domain of materials science and engineering that studies the physical and chemical behavior of metallic elements, their inter-metallic compounds, and their mixtures, which are known as alloys. Metallurgy encompasses both the sci ...

in Britain, at the

University of Birmingham The University of Birmingham (informally Birmingham University) is a Public university, public research university located in Edgbaston, Birmingham, United Kingdom. It received its royal charter in 1900 as a successor to Queen's College, Birmingha ...

. The Turner-Sclerometer test consists of microscopically measuring the width of a scratch made by a

diamond Diamond is a solid form of the element carbon with its atoms arranged in a crystal structure called diamond cubic. Another solid form of carbon known as graphite is the chemically stable form of carbon at room temperature and pressure, ...

under a fixed load, and drawn across the face of the specimen under fixed conditions.

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Testing the Hardness of Metals
* * Concrete Hardness instruments Metallurgy Mineralogy {{geology-stub

See also

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External links