Diffraction Kit, transparency, set of DOUBLE SLITS.

All slits are 0.025mm wide.
Upper row: 0.175, 0.150, 0.125, 0.100, 0.075, 0.050mm pitch, centre to centre.
Lower row: 0.325, 0.300, 0.275, 0.250, 0.225, 0.200mm pitch, centre to centre.

Brand : IEC