mõõtevahenditele antud suuruse mõõtmise jaoks koostatud riigisisene kalibreerimisastmestik, kus iga mõõtevahendi kohta kehtib eristuskiri metroloogiliste karakteristikute ja ühiku ülekandemeetodite ja -vahenditega, hierarchy scheme for given kind of measuring instruments in the particular country, containing specification of recommended (permissible) kinds of measuring instrument for individual levels of metrological traceability, requirements for their metrological characteristics and recommended (permissible) methods and means of unit transfer, hierarchy scheme for a given type of measuring instrument in the particular country, containing the specification of the recommended (permissible) types of measuring instruments for individual levels of metrological traceability, requirements for their metrological characteristics (accuracy class, maximum permissible error, etc.) and recommended (permissible) methods and means of dissemination of units