Manual and automatic pipet controller devices and consumable pipets (serological, volumetric, aspirating, transfer, Pasteur, dropping, measuring, milk bacteriological, Ostwald-Folin) for collecting, measuring, and transferring small to large volumes of liquid. Products may be reusable, disposable, constructed from glass or plastic (typically polystyrene), sterile, nonsterile, autoclavable, cotton-plugged, or plain and suitable for use in laboratories, hospitals, and school biology classes.