NAVIGATION
Quartz Optical Window, 50.8mm (2.0in) dia x 5mm (0.20in) thick
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Zinc selenide Optical Window, 50.8mm (2.0in) dia x 2mm (0.08in) thick
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Cesium iodide Optical Window, 50.8mm (2.0in) dia x 2mm (0.08in) thick
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Gallium arsenide Optical Window, 25.4mm (1.0in) dia x 2mm (0.08in) thick
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Ruby sphere; diameter(mm), 1.19 (3/64 in); grade 25
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Ruby sphere; diameter(mm), 1.59 (1/16in); grade 25
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