Leitz 100X oil immersion Microscope Objective that will fit the Leitz Laborlux and Ortholux series of  170mm TL microscopes.  The numerical aperture is (n.a.) 1.30 and it requires a coverslip thickness of 0.17mm.   All glass is free from fungus, dust, scratches, element separation, or oil fouling of internal lenses. The image is very pristine, crisp and sharp just like new.  THE SALE IS FOR ONE EACH