The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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inverse meter-atomic mass unit relationship
 $ (1\,{\rm m}^{-1})\,h/c = [{\rm m}^{-1}\,h c /(m_{\rm u}\,c^2)]\, {\rm kg} $
 Numerical value  1.331 025 050 10 x 10-15 u
 Standard uncertainty  0.000 000 000 40 x 10-15 u
  Relative standard uncertainty  3.0 x 10-10
 Concise form  1.331 025 050 10(40) x 10-15 u    
The full description of unit m-1 is cycles or periods per meter.
 
Click here for correlation coefficient of this constant with other constants
Source: 2018 CODATA     
recommended values
 
Definition of
uncertainty
 
     Correlation coefficient with
any other constant

 
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