The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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von Klitzing constant
$R_{\rm K}$
 Value  25 812.807 557 OmegaRed
 Standard uncertainty       0.000 018 Omega
  Relative standard uncertainty   6.8 x 10-10
 Concise form  25 812.807 557(18) Omega    
 
Click here for correlation coefficient of this constant with other constants
Source: 2006 CODATA     
recommended values 		 Definition of
uncertainty 		      Correlation coefficient with
any other constant

 
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