Specifications:

1. A double-axis diffraction grating (with intersecting lines in two directions).
2. Used for studying the spectrum of light based on the principle of light wave interference.
3. Made of a transparent or translucent sheet with fine lines intersecting at right angles, resembling a mesh grid.
4. Total number of lines is no fewer than 13,400 lines per inch.
5. Comes with a paper frame surrounding the grating sheet.