This is a hand-held oscilloscope paired with a Magcheck 95 calibrated EMF sensor.

For those who want to know what this rig does, it displays the Frequency and Waveform of electromagnetic fields and waves. This is useful because once you are familiar with what common and mostly man-made EMFs look like and what frequencies they have you can quickly determine if an EMF is normal or not. That way you don't waste you time investigating common interference and you can concentrate on what may be paranormal EMFs.