An inspection device for inspecting a steam generator having a first long and flexible video probe intended to be inserted inside the housing of the steam generator and configured to be moveable through a fluid passage orifice defined by a spacer plate and a flow tube, all arranged inside the housing. The first video probe includes at least one ferromagnetic element. The inspection device also includes a second long and flexible probe to be inserted into a flow tube, the second probe including at least one permanent magnet arranged to cooperate with the at least one ferromagnetic element of the first probe so that the first probe can be driven along the exterior surface of a flow tube by the second probe when the second probe is inserted into the flow tube and moved therein, and when the first probe is inserted into the housing of the steam generator and positioned near the exterior surface of the flow tube in which the second probe is inserted.