A reader for a radio frequency identification system capable of simultaneously reading tags operating a multiple frequencies. The generator is responsive to the system controller for generating an electro-magnetic field that includes a tracking volume of highest accuracy. The properties of at least one other drill hole are determined on the basis of the dominating properties of the master hole. The sealing member extends away from the base in a first molded position. In one embodiment, the dialysate regeneration chamber may include a toxin trap configured to selectively trap toxins and repel select cations. In this manner, cross-frame image interference is avoided and the left and right perspective image display periods can be expanded.