Friction Pad DTS to your Vernier, Standard Cart, Plunger Cart, or Motion Encoder Cart, and watch the carts move under very consistent friction force. Setting the friction amount is as simple as turning a knob
Diffraction Apparatus, Used to map light intensity versus position for many-slit geometries, Slits are made by depositing metal film on glass, creating extraordinarily clean slits with fully opaque blocking areas.