The present invention includes a method for analyzing an image wherein elements defining a path within a two-dimensional image are received from a prescreener. As viewed from the top, one of each of the right- and left-hand pairs of connecting rods crosses the other of the pair of rods, and, as viewed from the side, the right- and left-hand pairs of rods are disposed parallel to each other. At power-down exit of the memory device, the power-down exit information can be selected between a fast wakeup time and a slow wakeup time. One end of each of the central conductors is connected to an inputoutput terminal, and the other end thereof is disconnected so as to be an electrically open end. The presence of an analyte is detected by a comparison of the spectroscopic properties of the chemical sensor in the absence and presence of the analyte. The second end of the elongated shaft is operable to be displaced in various directions by interactions with both hands of the user.