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Scleroscope

American  
[skleer-uh-skohp, skler-] / ˈsklɪər əˌskoʊp, ˈsklɛr- /
Trademark.

  1. a brand name for a sclerometer that determines the hardness of a material by measuring the rebound of a standard ball dropped on the material from a fixed height.

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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.