  The expected sensitivity of cluster SZ number counts to neutrino mass in the
sub-eV range is assessed. We find that from the ongoing {\it Planck}/SZ
measurements the (total) neutrino mass can be determined at a (1-sigma)
precision of 0.06 eV, if the mass is in the range 0.1-0.3 eV, and the survey
detection limit is set at the 5-sigma significance level. The mass uncertainty
is predicted to be lower by a factor ~2/3, if a similar survey is conducted by
a cosmic-variance-limited experiment, a level comparable to that projected if
CMB lensing extraction is accomplished with the same experiment. At present,
the main uncertainty in modeling cluster statistical measures reflects the
difficulty in determining the mass function at the high-mass end.
