Graduated screen

This versatile screen has 2 graduated faces:
1 - A white screen 50 x 30 mm symmetrically graduated in mm (-25 / 0 / +25 mm) allows for measuring diffraction spot widths with the laser diode.
Aligning the screen with the diode is very simple because the housings are identical and therefore at exactly the same height.

2 - The graduated screen 80 x 70 mm is used for classical optics experiments: light spectrum, color mixing, image, etc...

1 unbreakable and unlosable stand allows positioning the screen according to the face being used.