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National Optical, 740-155, DIN 40x Retractable Objective Lens, 0.65 N.A., 210 Series Only
The National 740-155 40x Retractable Objective Lens is for use with the 155 microscope series. It features a 0.65 numerical aperture and 40x magnification. A retractable objective lens provides additional protection against lens or slide damage.
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