Whilst I don't think it killed anything big that I have - for me, it stopped them moving up into my head when the pads were worn on the back of the neck - so from my experience, the TENS is able to stop them moving into the head. The only think that killed my flukes outside of the GI tract was high dosage prazi.

I read the intereaction between yourself and Geritol so I know both of your positions on this matter - he thinks he killed many with high voltage with the TENS, and you felt it was too dangerous - and that the zapper was more beneficial and safer long term. My use of TENS was for herding out of the head if you have that kind of problem, I thought the TENS was very useful. I didn't use particularly high voltage myself and didn't attempt to kill any in this way.