411 REFERENCE · Wiktionary
Knoop test
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
Knoop hardness test
Etymology
Developed by Frederick Knoop and colleagues at the National Bureau of Standards of the United States in 1939.
Noun
A microhardness test in which a pyramidal diamond point is pressed into the polished surface of the test material with a known load, for a specified dwell time, and the resulting indentation is measured using a microscope.
Related terms
en Knoop hardness
en eponyms