Iris Diaphragm with Adjustable Aperture, 3" Outer, 30mm Max Biology_Microscopy card screen card screen this decade resistance box fits bench circuits that need precise Adjustable iris from closed to a 30mm maximum aperture inside a 3 inch black metal body 5 inch mounting rod giving 5 inches total length for standard optical bench setups
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Iris Diaphragm with Adjustable Aperture, 3" Outer, 30mm Max Biology_Microscopy card screen