You just point it at electronics and you can hear them. In another video he diagnosed the problem where an amp had a 120hz ripple by probing for the noisiest thing in the chassis https://youtu.be/6P4C9at5rV8
@Thad E Ginathom skip to 1:18:00 in the second video I linked. It's pretty cool stuff https://www.youtube.com/watch?v=6P4C9at5rV8&feature=youtu.be
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