First, you are wrong about the testimonials.While I can not say that none were made up, I can say that very many are valid. I have heard from many over the years who had bough zappers that had significant results from using them. Many bought ParaZapper because they had worn out their old zappers and did not want to stop zapping.
Once again, I had personal experience with this and failed to eliminate intestinal parasites until I used an improved zapper with copper footpads and paddles at the same time to generate an all over signal. I finally had dead parasites coming out. I have previously posted on this several times.
Ascaris is difficult to kill in the body and using anything is hit or miss.