An image forming apparatus includes a toner case containing a toner and an installed member in which the toner case is installed. The invention further provides software for controlling, acquiring, and recording data relating to electrophysiological properties of receptors and channels in biological membranes of test subjects, such as, for example, oocytes. Upper sections, each of differing length, may be combined in various combinations with lower sections, each of different overall length andor lower section grip height, according to a fitment table. The rod may be fiberglass or a naturally-occurring material exhibiting rigidity with limited flexure.