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)
With holder & choke 80W & 120W
Ground & polished faces, edges ground. Size 50 mm high & 45 mm wide.
Polished 90 mm dia & 20 mm thick approx.
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