we are Cnscope,and we are professional Microscope and Ophthalmic instruments 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 pls feel free to contact us first,thankyou,welcome wholsaler also!!