This instrument is easy to set up, easy to use and is designed to make precise measurements. Features high quality 22mm optics, a built-in illuminated auto-collimator for fast set up, a 17.8cm diameter divided circle with clear graduations, a double-ended vernier with illuminated magnifier reading to 1' resolution, and a 7cm diameter prism table which rotates 360 degrees and adjusts 2cm in height to accommodate various accessories. The spectrometer is supplied with diffraction grating and grating holder, prism, illuminated magnifier, auto-collimation mirror, power supply (for 110VAC) and an instruction manual. Shipping weight: 29 lbs; Dimensions: 17" x 17"x 12".