NAVIGATION
Potassium chloride crystal optic disc, 13mm x 1mm, polished both sides
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Potassium bromide crystal optic disc, 13mm x 1mm, polished both sides
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Calcium fluoride crystal optic disc, 13mm x 1mm, polished both sides
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Sodium chloride crystal optic disc, 25mm x 2mm, polished both sides
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Potassium chloride crystal optic disc, 25mm x 2mm, polished both sides
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Potassium bromide crystal optic disc, 25mm x 2mm, polished both sides
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