knoop

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[Frederick Knoop (1878–1943), US instrument-maker.] Used attrib. to designate an indentation test devised by Knoop and the pyramidal diamond indenter used in it
knoop hardness
(metallurgy) The relative microhardness of a material, such as metal, determined by the Knoop indentation test
Knoop scale
scale of hardness ratings assigned to materials based on the results of the Knoop indentation test