Cool stage is a device that assists to very rapidly freeze liquid samples or samples holding moisture to maintain the current state so that they can be filmed effectively. Also, it can be heated, so the variation of samples according to temperature changes can be observed in real time. 1. Cool Stage is a device that rapidly freezes and films samples. 2. Since the electron microscope can not film a liquid state, it can measure effectively by freezing the liquid state to measure it in a solid state. 3. It is possible to measure the change of samples in accordance to the temperature change by heating. 4. If used with the BSE detector, users can obtain more efficient images.