These specially developed diffraction gratings produce a spectrum equivalent to a conventional grating of about 750 lines/mm. They are much more efficient than conventional gratings. The spectrum is bright enough for class discussions, even in normal room light. Available in three formats.

Ideal for Overhead Projector Use
A large 12cm square grating mounted between glass plates for easier handling and to prevent scratch damage. Includes four 5cm square color filters (red, yellow, green, and blue) to demonstrate how filters affect spectra, Use this grating for direct viewing or to project bright spectra with an overhead projector.