Abstract: A non-destructive testing (NDT) system which includes a chassis, a NDT scanner which may be an ultrasound scanner, a drive system comprising at least one drive wheel and at least one drive motor, a guidance system operatively connected to the drive system for controlling the motion of the NDT system, and a magnet assembly for adhering the NDT 5 system to a ferromagnetic object, which magnet assembly is configured to be switched on or off as required.