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a carefully prepared metal block used to calibrate hardness test machines (see: hardnessmeter), kindla kõvadusega lihvitud ja poleeritud terasplaat kõvadusmõõturite kalibreerimiseks (vt kõvadusmõõtur)
standard hardness block . Materjalitehnika terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mtr/standard%20hardness%20block/1/eng (02.08.2026)