Consists of a heavy cast base and a pillar for collimator support. A telescope arm moves along a fixed circular plate 150mm diameter, graduated in degrees. Circular plate with a double ended vernier for better accuracy with a least count of 30 degree. Fine adjustment by using a knob and coarse adjustment by hand. Collimator and telescope mounted with an axis adjustment system. Telescope and collimator fitted with coated achromatic objective of 32mm diameter and 178mm focal length. Focusing by rack and pinion. Collimator slit 6mm long. 10x Ramsden eyepiece with crosshair. 75mm diameter prism/grating table, fully adjustable, with prism and grating holders, and an engraved ring pattern. Built-in magnifying eye glass for reading vernier scale. Supplied in a wooden box with instruction manual. Product ID Product Name Specification Unit Quantity Add LI320-0000 Spectrometer, Advanced As above ea