The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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Copper x unit
 ${\rm xu}({\rm CuK}\alpha_{\rm 1})$
 Numerical value  1.002 076 97 x 10-13 m
 Standard uncertainty  0.000 000 28 x 10-13 m
  Relative standard uncertainty  2.8 x 10-7
 Concise form  1.002 076 97(28) x 10-13 m    
 
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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