An oscilloscope is a type of electronic test instrument that displays a real-time visual representation (the waveform) of an electrical signal. The graphical representation shows the electrical signal in a similar way to that of an audio waveform that we've looked at previously, with the X-axes representing time and the Y-axes showing the signal's voltage. This allows you to see the amplitude, frequency, and wavelength of the wave.

Oscilloscopes are mainly used for analyzing and debugging circuits, but they also have a use in the paranormal field. Using an oscilloscope for ITC is similar to using an EMF meter. The hope is that any spirits present can somehow manipulate the electrical signal being displayed or generate their own in order to communicate. A modern oscilloscope will show you the waveform on an FFT digital screen. The scope usually has a ground clip that clips to the negative terminal of a circuit...