We are FYSCOPE, and we are professional microscope supplier, we have our own factory and also have several co-operative enterprises, so we have multiple microscope part, in future, there will be more items listed in our store, we have our own technicians to check all the items before sent out, and also have professional workers to pack packing, so there is no extra worries. Welcome bid, if you have any more question please feel to contact us first, thank you. Welcome wholesaler You will get what you want FYSCOPE 4X, 10X, 40X, 100X 4PCS Biological Microscope L=185 Achromatic Objective Lens with thread mouning size 20.14mm Specification: Brand New and Hight Quality 4 Standard DIN 160/0.17 objective lens: 4X/0.10, 10X/0.25, 40X/0.65 (spring)and 100X/1.25 (spring,oil) Mount size: 20mm thread Spring loaded 40x and 100x for protecting slides and lens Conjugate distance:185 20.14mm Mounting Thread (in diameter) PACKING LIST: 1pcs 4X 1pcs 10X 1 pcs 40X 1pcs 100X