The demise of the profile projector has long been predicted, with the expectation that the instrument would be supplanted by various types of vision systems. However, reports of this instrument’s obsolescence are obviously premature. For many parts with complex profiles, such as screw threads, gear teeth, nozzles, fuel injectors, and other precision hydropneumatic and electromechanical components, there are numerous benefits in the capability and design of a profile projector that make the instrument the ideal choice for many quality inspection applications .