measurement standard based on an inherent and reproducible property of a phenomenon or substance
EXAMPLE 1: Triple-point-of-water cell as an intrinsic measurement standard of thermodynamic temperature.
EXAMPLE 2: Intrinsic measurement standard of electric potential difference based on the Josephson effect.
EXAMPLE 3: Intrinsic measurement standard of electric resistance based on the quantum Hall effect.
EXAMPLE 4: Sample of copper as an intrinsic measurement standard of electric conductivity.