The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Constants,
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Uncertainty
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Compton wavelength
 $\lambda_{\rm C}$
 Numerical value  2.426 310 238 67 x 10-12 m
 Standard uncertainty  0.000 000 000 73 x 10-12 m
  Relative standard uncertainty  3.0 x 10-10
 Concise form  2.426 310 238 67(73) x 10-12 m    
The full description of unit m is meter per cycle.
 
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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