The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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inverse meter-atomic mass unit relationship
$(1 \ {\rm m}^{-1})h/c$
 Value  1.331 025 0394 x 10-15 u
 Standard uncertainty  0.000 000 0019 x 10-15 u
  Relative standard uncertainty   1.4 x 10-9
 Concise form  1.331 025 0394(19) x 10-15 u    
 
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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