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diamond indentor

noun
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variants: or diamond indenter

Definition of diamond indentor

: an instrument for measuring hardness by the depth of the indentation made by a pyramidal diamond point under a given load

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“Diamond indentor.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/diamond%20indentor. Accessed 25 January 2020.

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