An apparatus and method for compressing video and delivering video over the Internet to users, wherein the video delivered is compressed to the specific variables of the users personal computing device. The signal injection circuit is coupleable to an item under test and to a source of common mode signal, and provides the common mode signal to the IUT. The movable component is movable toward the bottom when an external force is applied to the case. If the above-mentioned predetermined signal is under the condition where an alignment is properly performed, the changes of the detected positions of the electrons reflect deviation of an axis. The outcome is represented by the relative positions of the first and second visual continuums.