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Similar to 3380-00 but with enhanced features for obtaining better quantitative results. Consists of a heavy cast base and a pillar for collimator support. The telescope arm moves along a fixed circular plate 6" (150mm) diameter graduated in degrees. This plate has a double ended vernier for better and accurate measurements, with a least count of 30. Fine adjustment is accomplished by using a knob while the coarse adjustment can be done by hand. Both the collimator and the telescope are mounted with an axis adjustment system. The telescope has a 10X Ramsden eyepiece and is fitted with a cross hair reticle. Both the telescope and the collimator are fitted with coated achromatic objectives of 7" (178mm) focal length and 1-1/4" (32mm) diameter, providing light for a brighter and sharper image. The focusing is done by a concealed rack and pinion. The collimator slit 1/4" (6mm) long, is specially designed for retention of initial accuracy during the life of the instrument. The prism table 3" (75mm) diameter is held with the help of a clamping screw enabling the table to be rotated in any direction. It has lines and concentric rings marked to assist positioning of prism in relation to leveling screws. It is fitted with a diffraction grating holder of aperture 1"x1" (25x25mm) and a clamp for holding prisms up to 1-1/2" (38mm) high. Provided with a magnifying eye glass to read the vernier, tommy bar for axis adjustment and flannel cloth. Supplied in a wooden box. Comes with instructions, an extensive Teacher's Guide and reproducible Student Handout.