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DIFFRACTION GRATING GPHY6225

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Transmission Type 30 x 25 mm. available 15000 lines per inch. Plate covered with mounted in plastic frame.

Diffraction Grating School quality 25 x 30 mm. 13400 lines per inch mounted in plastic frame.

Transmission type 38 x 50 mm. available 15,000 lines per inch. Replica on glass plate covered with another glass plate.