  We propose that the finite size of the Kondo screening cloud, xi_K, can be
probed by measuring the charge quantization in a one-dimensional system coupled
to a small quantum dot. When the chemical potential in the system is varied at
zero temperature, one should observe charge steps that are controlled by the
Kondo effect when the system size L is comparable to xi_K. We show that, if the
standard Kondo model is used, the ratio between the widths of the Coulomb
blockade valleys with odd or even number of electrons is a universal scaling
function of xi_K/L.
