The Cygnus S1 Probe Handler is designed for performing UT thickness surveys on ships’ hulls with an Observation or Light work class ROV. On contact with the hull plate two sets of magnets first grip the steel, then as the ROV pushes forward the UT probe is allowed to tilt to align it to the hull surface placing the UT probe in the optimal position for measurement with the ROV pilot just having to maintain gentle forward thrust while the measurement is taken. The S1 probe holder is constructed from acetyl with stainless steel fixings keeping the overall weight down.