GRATING SPECTROSCOPE (0721) A diffraction grating spectroscope for viewing visible lines and absorption spectra. The spectrum is visible, superimposed on a scale, which gives the approximate wavelengths. The high resolution diffraction grating replica used, produces extremely bright spectrum. Complete body of unbreakable moulded plastic and can easily be held in the hand. The construction eliminates internal reflections to provide the sharpest, clearest spectrum. Qty :