If the Hulda Clark devices actually worked you would only have to use them once.
I still have herpes Zoster even with my Atelier Robbin F165. I used the Hulda Clark and all known frequencies for Herpes Zoster. Used carrier waves etc etc. Sweep features. It helps but so far doesn't completely get rid of the virus.
Maybe if I used it day after day it could work. Maybe the virus is in a different form while incubating. etc etc etc.