[Elecraft] Zero-beating on CW

[Ted Edwards W3TB]

I have never been convinced of being accurate on zero-beat on my K3.
With previous radio units, I would zero-beat by matching the tone of the
received station with my own keying side-tone.  But it does not seem
accurate on the K3.

So the question:  How would I determine that my offset and side tone would
match up so that I am really zero-beated when I think I am.

Thanks ahead of time.

-- 
73 de Ted Edwards, W3TB and GØPWW

and thinking about operating CW:
"Do today what others won't,
so you can do tomorrow what others can't."