Re: Question about zappers

>- do typical zappers "sweep" through all the different frequencies to accomplish the job or one single frequency kills most of them?

There are some that sweep but generally, I find that this is not as effective because it takes several minutes at any frequency to be effective.

Generally, the zapper produces a square wave which is composed of harmonics that reach into the higher frequencies and affect parasites.

For a discussion of this, see; Zapper FAQ