The 174 Hz tuning fork is the primary tool used in Biofield Tuning. It is considered the "work horse" of the process of field combing due to its ability to locate, resonate with, and resolve distortions.

It is an ideal frequency for the technique of “field combing” because of its ability to provide useful feedback with the wide range of overtones it emits. To use sandpaper as a metaphor, think of the 174 Hz fork as a medium-grit sandpaper, suitable for most applications.