Polished 90 mm dia & 20 mm thick approx.
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9cm x 14.5 cm , pack of 25 sheets.
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 :
Rectangular, all sides polished, made from slightly greenish glass free from bubbles Dimensions (a) 75 x 50 x 12 mm (b) 75 x 50 x 18 mm (c) 100 x 60 x 18 mm (d) 115 x 65 x 18 mm (e) 125 x 65 x 18 mm.
Whte finish metal box, mounted on a steel rod with 12V 100W halogen lamp
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