Abstract: A non-contacting, electro-optical system adapted automatically to measure the contour of a shaped object held in a fixture with its contoured surface presented to an electro-optical triangulation rangefinder assembly. The assembly is constituted by a pivoted laser beam illuminator and a pivoted automatic tracker mounted for rotation at spaced pivot points on a supporting beam, the line extending between these points forming a triangulation baseline. The illuminator is caused to swing through a sector whereby the laser beam spot scans across the surface of the object being tested from one edge to the other. The angles assumed by the illuminator and those assumed by the tracker in the course of a scan are determined and fed to a computer in which the value of the baseline is stored, the computer calculating the changing spot location by triangulation.