The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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electron-proton magnetic moment ratio
 $\mu_{\rm e^-}/\mu_{\rm p}$
 Numerical value  -658.210 687 89
 Standard uncertainty     0.000 000 19
  Relative standard uncertainty  3.0 x 10-10
 Concise form  -658.210 687 89(19)    
 
Click here for correlation coefficient of this constant with other constants
Source: 2022 CODATA     
recommended values 		 Definition of
uncertainty 		      Correlation coefficient with
any other constant

 
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