This instrument features larger 30mm diameter optics that gives brighter line images and make precise measurements easier. The optical focusing system has been refined and the instrument retains the same premium features as the earlier version, including the built-in illuminated autocollimator for fast set up, 17.8cm diameter divided circle, double-ended vernier reading to 1' resolution, and 7cm diameter rotatable and height-adjusting prism table to accommodate various accessories. The spectrometer is supplied with a 300 lines/mm diffraction grating and grating holder, high quality prism, illuminated magnifier, auto-collimation mirror with a power supply for 110VAC, and an instruction manual.