Thiel did not use an old style 30KHz zapper. Production of the SyncroZap stopped in 2003. Here is what his study said:
"Two different zappers were used: A commercial model and a specially engineered model. The commercial model used was a SyncroZap Pulse Generator Model B3 from Self Health Resource Center, Imperial Beach, California; it is operated by a 9 volt battery and produces a 32KHz output. The engineered model was based upon the same design as the commercial model (was also operated by a 9 volt battery), but due to an extra integrated circuit, its output sweeps the frequency in steps of 2KHz from 20-40 kHz (this sweeping is believed by the developer to generate an output at 10 times as many frequencies than the commercial model). The commercial model was normally held for 7 minutes with 15-20 minute breaks, while the engineered middle was normally held for 15 minutes with 10 minute breaks."