A image acquisition device including a connection section having an opening; an optical-path switching unit that changes an optical path of light entering from the opening; and two image acquisition elements. A predefined set of attributes are extracted or obtained for a computer system artifact, together with a number of values assigned to the set of attributes. The processor has software capable of performing bio-activity calculations on the plurality of images. The rotating bar is rotatably connected to the inserting mount and has a grip, a switching shaft and a spring. The holding parts include a curved contact surfaces that contact opposite side surface of the cell material.