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hardness of a material, which is expressed by the Rockwell hardness number – HR, which is directly displayed on the dial, materjali kõvadus, mida väljendab Rockwelli kõvadusarv – HR, mis kuvatakse otse mõõtevahendi näidikul
Rockwelli kõvadusarv . Metroloogia terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mea/Rockwelli%20k%C3%B5vadusarv/1/est (06.08.2026)