Plane, circular, ground edges. Back silvered with protective coating
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Having measuring range 0-32% sugar scale. Nicely packed in velvet box with zero adjusting screw driver.
Ground & polished faces, edges ground. Size 50 mm high & 45 mm wide.
Optically worked, ground edges
Made from moulded glass, polished surfaces (a) 75 x 50 x 18 mm (b) 100 x 60 x 25 mm.
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