[Elecraft] Installed K3EXREF

[Rick Stealey]

Excellent posting by W9AC, a great reference, to be saved.
Now I wonder if it would be possible for someone to enlighten me as to 
the need for such extreme accuracy?  Is it because my K3 reads out to 1 Hz
but I can't really believe the absolute accuracy of that number unless I 
get a K3EXREF?  But if that is the case, my question would still remain,
wouldn't it?
Not that I need something else to put on my list ahead of my P3 and 
sub receiver.
Rick  K2XT