  A muon telescope equipped with four Resistive Plate Chambers of 2 m$^{2}$ per
plane was tested with the muon scattering tomography technique. The telescope
was operated during several hours with high atomic number materials located at
its center with two detector planes on each side. With an intrinsic efficiency
above 98%, spatial resolution around 1 cm and detector planes spaced by 45 cm,
it was possible to identify the presence of a 5 cm thick tungsten block in 10
minutes of acquisition. The results obtained after five hours of acquisition
are also presented in this communication.
