A probe capable of inducing a rotating magnetic field to excite a conductive tube includes an array of magnetic field sensors to detect and characterize defects in the tube. The probe includes a circumferential coil assembly and an axial coil assembly both positioned to induce eddy currents in the conductive tube, such that the magnetic field sensors can detect defects in the tube, including defects extending circumferentially, axially, or any combination thereof, whether at the surface or sub-surface of the tube inner and outer walls.