The best zapper is one that not only has multiple frequencies, but splits those energies into two separate waveforms. These dual outputs sandwich pathogens between a primary energy emission of multiple frequencies and a secondary waveform whose frequency is automatically controlled by the user's body during the zap session.
This is exactly what a Thundervolt zapper does. Our handholds and footpads have removeable and switchable plugs. Changing the order of these plugs for the second and third zaps reverses the zapping polarity, increasing the stress on targeted pathogens. We also have a Body Tester that measures and verifies the benefits of zapping. We are the only ones in the industry offering a Body Tester for retail sale, and it's inexpensive.