An apparatus for measuring speed, the length and elongation of a molten glass gob travelling along a defined path includes at least two optical detectors. A mask having at least two openings through which light passes to each of the optical detectors is disposed adjacent the optical detectors. A lens receives light from the moving glass gob and focuses such light through the openings of the mask. Electronics are coupled to each of the optical detectors for determining the speed of the molten glass gob as a function of timing of light sensed at the optical detectors. In exemplary embodiments of the disclosure, the optical detectors is disposed within the image plane of the lens and comprise different portions of a single light sensing device.