This is a 3-piece add-on for 303-style laser pointers, designed to perform the Young’s double-slit experiment with stable alignment. The kit contains:

Laser Tube Mount – the main piece that holds the laser

Front Guide Ring – glued onto the Laser Tube Mount to create a slot for the slit insert

Double Slit Insert – a thin sliding piece containing the double slit

⚠️ Assembly note: The Laser Tube Mount and Front Guide Ring must be glued together with super glue (cyanoacrylate). Once assembled, they create a precise guiding slot that holds the Double Slit Insert firmly in place.

You can use the built-in double slit, or insert your own material. A single human hair also works extremely well and produces a clean diffraction pattern.