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known quantity of mass used in a measuring instrument as a reference for the measurement of an unknown quantity, teadaoleva massiga keha, mille massi kasutatakse mõõtevahendis võrdlusena tundmatu massi mõõtmisel
test mass . Metroloogia terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mea/test%20mass/1/eng (01.07.2026)