  A simple experimental setup for measuring the Planck's constant, using
Landauer quantization of the conductance between touching gold wires, is
described. It consists of two gold wires with thickness of 0.5 mm and 1.5 cm
length, and an operational amplifier. The setup costs less than $30 and can be
realized in every teaching laboratory in two weeks. The usage of oscilloscope
is required.
