Spectrometer with 6" Circle Adjustable Prism table marked with grooved lines, Telescope mounted on movable pillar having fine adjustment Double ending verniers reading 30 Secs Arc Determine Prism Angle Refractive Index Wavelength & Frequency measurement of Reflected light Heavy Metal base for stability Adjustable Prism table marked with grooved lines Main graduated scale of 150mm (6") Double ending verniers reading to 1 min to 30 Secs Arc depending on model Telescope mounted on movable pillar having fine adjustment Collarimeter mounted on fixed pillar with objective Eyepiece & Rack Pinion Fine Focusing.