A column redundancy system including a column redundancy apparatus for performing a redundancy swapping operation of column elements within the individual micro-cells. In response to detecting a second input with a second button at a second time, when the first button is an unconditionally enabled button and the second button is an unconditionally enabled button, the second button is activated. The desired isolation area may be identified by changing the conductivity type of the semiconductor material to be etched. The device obtains signal values for the detection lines from the output signal and processes the signal values to at least partly compensate for variations in the apparent interaction among the subset of detection lines that interact with an object on the surface portion. In a preferred form, the electronics module and sensors are wireline insertable and retrievable into a side pocket mandrel in the tubing string. When the first gear position is on the low speed side of the second gear position, a shift is performed to a gear position on a high speed side of the first gear position.