Abstract: A measurement device provides coordinates for a specified location and position on the exterior surface of a vessel, including a base adapted to contact the exterior surface of the vessel; a rail extending upwardly from the base, the rail including a measurement scale; a head slidably supported by the rail; the head including a clamping mechanism used to releasably secure the head to the rail; and a laser carried by the head for projecting an image on the exterior surface of the vessel. The device quickly measures both the radial position and the angular position of an indicated location relative to the axis of the nozzle, and the skew of a transducer probe which provided the indicated location.