Check the listing for details. Spectrometer 6" D Optical diff Prism Refractive Index Physics Lab Apparatus New. Condition: New. Listed at 141.05 USD. Spectrometer 6" D Optical diff Prism Refractive Index Physics Lab Apparatus New Item Description-Features & Specification-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 1500 mm (6")-Double ending vernier 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. Box Contains--Spectrometer with 6" circle.-1 min on Arc.-Opposite Verniers.-Storing Box.-Prism Table.-Diffraction Grating.Note:- Custom/Duty and charges will be paid by buyer (if any) Please check in advanced