  Tuning forks are very popular experimental tools widely applied in low and
ultra low temperature physics as mechanical resonators and cantilevers in the
study of quantum liquids, STM and AFM techniques, etc. As an added benefit,
these forks being cooled, have very high Q-value, typically $10^6$ and their
properties seems to be magnetic field independent. We present preliminary
vacuum measurements of a commercial tuning fork oscillating at frequency 32~kHz
conducted in magnetic fields up to 8~T and at temperature $\sim 10$~mK. We
found an additional weak damping of the tuning fork motion depending on
magnetic field magnitude and we discuss physical nature of the observed
phenomena.
