from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun An instrument used to determine the relative hardness of a material by measuring the pressure required to penetrate the material with a standard diamond stylus.
from The Century Dictionary.
- noun An instrument for determining with precision the degree of hardness of a mineral.
from the GNU version of the Collaborative International Dictionary of English.
- noun An instrument for determining with accuracy the degree of hardness of a mineral.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A device used to measure the
hardnessof a material by applying pressureto a moving diamond stylus
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a measuring instrument that measures the hardness of materials by penetrating them with a stylus that has a diamond point
Sorry, no etymologies found.
Concrete test hammers, known as sclerometer model "N", are not appropriate, as the impact energy is too high.
The range of measurements should be from 0 to 500 or 800 N, which corresponds to a sclerometer known as model "PT".
The surface hardness of a block can also be measured in a non-destructive way, using a pendulum sclerometer.