Yes, as far as we know our zappers only produce a positive offset voltage. Obviously, we can’t personally check each zapper we sell to make sure, but the manufacturers we use all follow Dr. Clark’s specifications closely and have assured us their products only produce a positive offset voltage.
We have checked most of our zapper models at different times to make sure they are producing a square wave with a positive offset. We have never found one that didn’t, so our comfort level is pretty good with our current crop of products.
Posted in: Zapper