Profile projectors and measuring microscopes are instruments used in metrology to precisely measure and analyze the dimensions and shapes of objects. A profile projector is an optical measuring instrument that is typically used to measure flat or planar surfaces. It consists of a light source, a lens and a projection screen. The object to be measured is placed between the light source and the lens, and the image of the object is projected onto the projection screen. By using scales or digital measuring systems, the user can measure the dimensions and shapes of the object. A measuring microscope is an optical measuring instrument that is usually used to measure smaller objects. It consists of a microscope and a measuring device connected to the microscope.