9cm x 14.5 cm , pack of 25 sheets.
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Plane, circular, ground edges. Back silvered with protective coating
Optically worked, back silvered, with protective coating.
Ground & polished faces, edges ground. Size 50 mm high & 45 mm wide.
Photographic replica gratings mounted on a plate glass & suitable for visual. Grading size 25 x 25 mm, on glass plate 50 x 38 mm. The grating are of :
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