Wondering which Hulda Clark Zapper to get? Let Dr. Clark and I help you decide. If you have a device that has a Positive Offset Square Wave, emits 30 kHz and 1 kHz, powered by a 9 volt battery, and has copper pipe electrodes, you have a Hulda Clark Zapper as described in Hulda Clark’s books.
Hulda Clark Zapper Comparison Chart: ClarkZapper.org
You can build your own: ClarkZapper.net
Already built for you: ClarkZapper.com