Having measuring range 0-32% sugar scale. Nicely packed in velvet box with zero adjusting screw driver.
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Diffraction Gratings replica mounted on a plate glass.. 2400 (lines/in) 7500 (lines/in) 15000 (lines/in)
Polished 90 mm dia & 20 mm thick approx.
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 :
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