Patent ID: 7870797

Claim:
An apparatus for aspirating liquid from a first target and dispensing the liquid to a second target, the apparatus comprising: a. a liquid handling device including one or more channel members; b. a liquid holding tip removably connectable to each one of the one or more channel members, wherein the liquid holding tip includes a tip wall at least partially including a waveguide-quality material integral with or adjacent to the tip wall; and c. one or more signal transmitting devices removably connectable or integral to one or more of the one or more channel members and configured to transmit a signal within the waveguide-quality material of the wall of the liquid-holding tip, wherein each of the one or more signal transmitting devices is capable of transmitting at least one first signal to the first target as an indication of the position of the liquid holding tip with respect to the first target, and wherein each of the one or more signal transmitting devices is capable of transmitting at least one second signal to the second target as an indication of the position of the liquid holding tip with respect to the second target.