Geritol has used TENS successfully for zapping with TENS at very high voltage. His posts are here on Curezone. I have tried TENS but couldn't get the voltage up high enough - some units go higher than others.. also you need to be prepared to accept the voltage which can be tough.... What I did find and can concur with Geritol is that the TENS (even at moderate voltage) is very good for herding worms away from certain places that is for sure... you can get the barstads to leave certain areas of annnoyance and move to other places which might be an attractive option as well.