An electromagnetic probe for non-destructive inspection of a twisted tube of a twisted tube heat exchanger comprising a probe body having a sensing section being configured to allow circulation of the probe body within the length of circular tube and the length of helical oval tube and to allow displacement of the electromagnetic sensor(s) from a radially inward contracted position to a radially outward expanded position in close proximity to an interior surface of a crest of the oval tube; a conduit attached to a proximal end of the probe body, the at least one conductor extending within the conduit to a remote end of the electromagnetic probe.