[Solved] What are database checkpoints? Specimen Slide: A thin slice of material, such as tissue, mounted on a slide for examination under a microscope. Microscope: An instrument used to view objects that are too small to be seen by the naked eye, magnifying tiny details for study or observation. Substage: A division or phase within a larger stage or process, often indicating a specific part of a broader developmental or operational sequence. Condenser: A device used to condense a gas or vapor into a liquid, commonly found in air conditioning and refrigeration systems.