___ scale (set of hardness ratings)

This crossword clue is for the definition: ___ scale (set of hardness ratings).
it’s A 35 letters crossword puzzle definition.
Next time, when searching for online help with your puzzle, try using the search term “___ scale (set of hardness ratings) crossword” or “___ scale (set of hardness ratings) crossword clue”. The possible answerss for ___ scale (set of hardness ratings) are listed below.

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Possible Answers: MOHS.

Last seen on: Vox Crossword Saturday, 9 December 2023