Made of optically flat plates cemented together. Dimensions 50 x 50 x 50 mm
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Diffraction Gratings replica mounted on a plate glass.. 2400 (lines/in) 7500 (lines/in) 15000 (lines/in)
Having measuring range 0-32% sugar scale. Nicely packed in velvet box with zero adjusting screw driver.
Optically worked, ground edges
Comprising a metal holder with sides grooved to hold the lens or mirror. The holder is finished in matt black & is free standing for bench use, to hold lens 50 mm in diameter.
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