  We summarize in this paper the spectro-polarimetric methods used at the Pic
du Midi Turret Dome in spectroscopic or imagery mode. The polarimeters and
spectrograph allow the cartography of solar magnetic fields at high spatial
resolution through the Zeeman effect or measurements of the unresolved
turbulent magnetic fields in the quiet Sun through the Hanle effect. We
describe in this paper the optical capabilities of the successive versions of
the polarimeters operating since 2003, and we present new results of magnetic
field analysis with the CaII K 3933.7 {\AA} spectral line.
