CODATA recommended values of the fundamental physical constants 2014 by National Institute of Standards and Technology
= CODATA recommended values of the fundamental physical constants 2014 by National Institute of Standards and Technology
{c}
{tag=Work by National Institute of Standards and Technology}
{title2=2014 adjustment}
https://physics.nist.gov/cuu/pdf/wall_2014.pdf
The 2014 adjustment gives the historical <Planck constant>, <elementary charge> and <electron mass> used for numerical evaluation. These are external reference values, without a claim about the exam handbook's rounding.