Judith, I have only tried Don Croft's zapper, crystal model.  My whole
family loves it.  We have two.   We also have Sota Inc.'s Beck blood
electrifier.  It is not the same thing as a zapper I undestand.  Anyway
it works great too.  Both relieve inflammation and fatigue.  They reduce
pain from whatever's painin ya.  We have had no blood work done and I
know very little about how they work.  But our experience is that they
do work.  Croft's is very easy and convenient to use.  As far as I can
tell there are no bad effects from either.   Sorry that's all I know.
pj  ps  You have to be careful with Beck's device.  You probably already
have read about that. 

Judith Thamm wrote:
> 
> Even after reading about zappers, I want to know which to buy.  Also
> the resonating thing?  Advice and price appreciated!
> Judith.
> 
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