A method of establishing communications in an all optical wavelength division multiplexed network. A torque sensor for calibrating screwing tools has an inner body defining an axis with respect to which a torque is to be measured. The optical device includes a first filter and a second filter. In some implementations, systems and apparatus are provided for applying a substantially condensed phase cryogenic fluid to a volume of biomass, and further having structure for collecting the biomass. Alternatively, individual cells may include passages that allow or inhibit ion flow between a substrate and an external electrode and that include electrodes or other control elements that can be used to selectively allow or inhibit ion flow and thus inhibit significant deposition or etching.