What can you see under a electron microscope?
Hence, if your sample meets the requirements listed, you should be able to see its image on a monitor just as clearly as you see an object of a much larger scale, with an optical microscope. Any items that are detrimental to a vacuum formation (moist, spongy materials, for example) should probably be avoided. From an electron microscope, I have seen something as big as the compound eyes of a fly or a feature as small as 1 nm.
