Re: RSG-4 sweep Zapper or ZHC5 Zapper by Sota???

Hi Comeback Kid, thanks for all the info. Instead of writing Christmas mail, ( I am already too late, anyhow...) I spent the last 3 hours on your yahoo site, first trying to figure out how it works, then trying to absorb some of the info about the godzilla. Interesting for sure... I am technically challenged, so have a few questions here.
What is the purpose of the meter scale?
Does one have to manually switch the current from one direction to other?
As for speed adjustments and timing settings,is there a manual that explains why?s and What for? and when to do what?
Since I may not have the money to right away buy both a zapper and a blood purifyer, in your opinion which one is more important? My guess is the Beck device. I may be prejudiced, since I used a friend's unit last summer for 5 weeks, great results.