The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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atomic unit of electric field gradient
 $E_{\rm h}/ea_0^2$
 Numerical value  9.717 362 4292 x 1021 V m-2
 Standard uncertainty  0.000 000 0029 x 1021 V m-2
  Relative standard uncertainty  3.0 x 10-10
 Concise form  9.717 362 4292(29) x 1021 V m-2    
 
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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