Spectrometer Standard 6" PSAW A basic instrument for performing spectroscopy experiments , designed to give best possible results, mounted on stable cast iron base, protracted scale 150mm is divided on precision machine ,vernier reading 1min., telescope is fitted with 25mm dia. and 178mm focal lenght achromatic objective, 10x Ramsden eye piece and cross line graticule, collimeter has an adjustable precision slit of 6mm long jaws of non rusting metal, 8cm dia. prism/grating table is adjustable and has engraved ring pattern. supplied in a beautiful plywood box with prism holder and grating holder.