The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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electron magnetic moment
 $\mu_{\rm e}$
 Numerical value  -9.284 764 7043 x 10-24 J T-1
 Standard uncertainty   0.000 000 0028 x 10-24 J T-1
  Relative standard uncertainty  3.0 x 10-10
 Concise form  -9.284 764 7043(28) x 10-24 J T-1    
 
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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