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These ultra-microtomes are designed to cut plastic embedded specimens (e.g. biological tissues, polymers) into very thin slices (sections) required for examination in a transmission electron microscope (TEM). The Ultramicrotome on top is a brand new RMC. The one on the bottom is a fairly new Leica UC7 on loan from Wood Science. Sections made with these tools are only a few nanometers thick and are cut by special glass or (expensive) diamond knives.