All tests are momentary

All tests are momentary.

This means less than one second. It is tempting to hold the
probe to your skin and just listen to the sound go up and down,
but if you prolong the test you must let your body rest ten minutes,
each time, before resuming probe practice!
For our purposes, it is not necessary to locate acupuncture
points.
Resonance
The information you are seeking is whether or not there is
resonance, or feedback oscillation, in the circuit. If there is the
test is YES (positive). You hear resonance by comparing the
second probe to the first. You can never hear resonance on the
first probe, for reasons that are technical and beyond the scope of
this book. You are not merely comparing pitch in the two probes.
During resonance a higher pitch is reached faster; it seems to
want to go infinitely high.
Remember that more electricity flows, and the pitch gets
higher, as your skin reddens or your body changes cycle. These
effects are not resonance.
Resonance is a small extra hum at the high end of the probe.
As soon as you hear it, stop probing. Your body needs a short
recovery time (10 to 20 seconds) after every resonant probe. The
longer the resonant probe, the longer the recovery time to reach
the standard level again.
Using musical notes, here is a NO (negative result): F-C-BC#
(first probe) F-C-B-C# (compare, it is the same sound). Here
is a YES (positive) result: F-C-B-C# (first probe) F-D (stop
quickly because you heard resonance). In between the first and
second probe a test substance will be switched in as described in
lessons below.

It is not possible to produce a resonant sound by pressing
harder on the skin, although you can make the pitch go higher. To
avoid confusion it is important to practice making probes of the
same pressure. (Practice getting the F-C-B-C# tune.)