The DF1 Rife Machine
It is difficult for me to make comment on these machines, because they are not really rife machines or zappers, rather they are a desktop Frequency Generator used for the tuning of Stage equipment. In fact Rolling Stones etc use a more advanced version of these on the road to check frequency output on their speaker systems.
So these machines are “Converted Frequency Generators” destined for the music industry, have limited programming ability (holding programs) usually cannot sweep, and are complicated to use.
If you are a bit “Techy” like myself you can play around and work them out, but as I said, no sequential playback of frequencies, limited or no storage beyond the face value output, Large and heavy box (not really portable) and basically equipment that’s been converted from a music equipment tuning device into a “Rough” Zapper.
Also the dials are not really digital. We sold Dial Zappers back in 2005
Just my opinion. Customer is free to choose.