A vertical profile projector is a precision optical instrument used to measure the profiles and contours of parts with vertical surfaces. In this device, the object is placed below the optical system, and its magnified image is projected vertically onto a screen. This type of profile projector is commonly used in industries like automotive, aerospace, and precision engineering to inspect small, intricate components with high accuracy. It helps in measuring angles, curves, and detailed dimensions, making it an essential tool for quality control and inspection, ensuring parts meet specific design requirements.