Any zapper works! Thats the beauty of it. You can compare one against another. You need to wrap the handholds with wet tissue paper that is mildly salty, and drink LOTS of herb tea to flush out the body of the toxins. We us a zapper thats on = www.holistic.me.uk , there are so many. There is Bruce Stenulson = www.stenulson.net , also www.toolsforhealing.com .