Black Quantitive Spectroscope

Reveal the hidden ture of colour and visible light with this durably constructed, conomical spectroscope. Measure the wavelengths of visible light from 4000 to 7000 Angstroms with the precision +/- 50 Angstroms using the built-in scale. Supplied with instructions that include the history of light theory, diffraction gratings, and suggestions for numerous experiments.