The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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natural unit of length
 $\lambdabar_{\rm C}$
 Value  386.159 268 00 x 10-15 m
 Standard uncertainty    0.000 000 25 x 10-15 m
  Relative standard uncertainty   6.5 x 10-10
 Concise form  386.159 268 00(25) x 10-15 m    
 
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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