NAVIGATION
Zinc selenide crystal optic rectangle, 30mm x 15mm x 2mm, polished both sides
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Sodium chloride crystal optic rectangle, 30mm x 15mm x 4mm (drilled), polished both sides
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Potassium chloride crystal optic rectangle, 30mm x 15mm x 4mm, (drilled), polished both sides
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Potassium bromide crystal optic rectangle, 38.5mm x 19.5mm x 4mm, polished both sides
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Calcium fluoride crystal optic rectangle, 38.5mm x 19.5mm x 4mm, polished both sides
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Sodium chloride crystal optic rectangle, 38.5mm x 19.5mm x 4mm (drilled), polished both sides
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