Grating For Laser 3-in-1

Grating For Laser 3-in-1 mounted in 90 MM x 30 MM glass frame with inner window size 10 MM x 10 MM.
Lines Per MM:
100 Lines per inch,
250 Lines per inch,
500 Lines per inch.
Sealed with Black Tape.
Apparatus required: Used with Laser Pointer only.

Package Contains:
1. Diffraction Grating - 1 No.
2. Box - PP/ABS - 1 No.