| Answer | Crossword Clue |
|---|---|
| sclerometer | an instrument for measuring the hardness of minerals |
| sclerometers | SCLEROMETER, an instrument for measuring the hardness of minerals |
| sclerometric | pertaining to measurement by sclerometer, an instrument for measuring the hardness of minerals |
| durometer | an instrument for measuring the hardness of substances |
| durometers | DUROMETER, an instrument for measuring the hardness of substances |
| penetrometer | An instrument for determining the consistency or hardness of a substance by measuring the depth or rate of penetration of a rod or needle driven into it by a known force |
| penetrometers | An instrument for determining the consistency or hardness of a substance by measuring the depth or rate of penetration of a rod or needle driven into it by a known force |
