The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Planck constant over 2 pi in eV s
$\hbar$
 Value  6.582 119 28 x 10-16 eV s
 Standard uncertainty  0.000 000 15 x 10-16 eV s
  Relative standard uncertainty   2.2 x 10-8
 Concise form  6.582 119 28(15) x 10-16 eV s    
 
Click here for correlation coefficient of this constant with other constants
Source: 2010 CODATA     
recommended values 		 Definition of
uncertainty 		      Correlation coefficient with
any other constant

 
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