The use of optical projectors is a time tested, cost effective, solution for non-contact measurement. "Shadow Graph's"  also commonly known as Optical Comparitors or Projectors are simple to use, yet have excellent capacity to satisfy a wide range of applications and measuring requirements. Optical Comparitors from Starrett boast precision optics, superb lighting and a highly accurate workstage which combine to ensure bright, sharp images and exceptional accuracy. Horizontal models work well with parts that need to be fixtured, held in a vice, or on centers.