Abstract: Automatic test equipment for determining the optical properties of a test object is described. A highly collimated test beam of approximately one millimeter diameter is directed through the test object, is reflected, and passes through the test object a second time. The test beam source may be a laser and spatial filter, or equivalent. The reflected beam intensity and the exit point and return slope angle at which this beam leaves the test object are accurately measured to determine the optical characteristics of the test object. In one described embodiment, the exit point is determined by moving a knife edge to a point where half the light is blocked. The angle is determined by focusing the reflected beam and determining the position of the focal point, i.e. image height, by means of a pinhole mounted on a three axis micrometer platform. The light transmitted through the pinhole is detected by a light sensitive diode or equivalent.