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° 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.Additional Spectrometer Prisms and Diffraction Gratings are available separately.Shipping weight: 29 lbs; Dimensions: 17" x 17"x 12".