A method for locating artifacts, such as particles or voids, in a material includes the steps of defining a path through a volume of the material, sensing the presence and type of any artifacts along the path and determining for each sensed artifact, the respective distance along the path. The device includes a moisture detector and a temperature detector for measuring moisture content level and temperature level of the oil, respectively. An output circuit is configured to receive the playlist from one or more second devices. The carrier member is adapted for intracochlear but extraluminar insertion within the cochlea of an implantee. Each of the nozzles has an orifice and at least three bubble generating components. The methods include application of, and the apparatus are adapted to apply, pressurized gas to at least one ink-filled pixel well on a substrate having a plurality of pixel wells.