The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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electron magnetic moment to Bohr magneton ratio
 $\mu_{\rm e}/\mu_{\rm B}$
 Numerical value  -1.001 159 652 181 28
 Standard uncertainty   0.000 000 000 000 18
  Relative standard uncertainty  1.7 x 10-13
 Concise form  -1.001 159 652 181 28(18)    
 
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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