64991-00 contains light source main unit with 2 lens installed and 1 tubular lamp, 2 plastic slits, 2 plastic mirror holders, 1 mirror for curved surface and 1 for flat surface, 1 trapezoid tank, 5 sheets colored cellophane, 1 experimental plate for trapezoid water tank, 2 plates for cylindrical lenses, 3 cylindrical lens, 1 extra tubular lamp, instructions.
64991-01 contains light source main unit with 2 lens installed and 1 halogen lamp, 2 plastic slits, 1 plastic mirror holder, 1 mirror for curved surface and 1 for flat surface, 2 plain beam plates, 1 cylindrical lens, 1 AC adapter, 1 semi-circle lens, instructions.
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