400 milliGauss? 400 milliGauss?!!! That’s the exact amount of power needed for the flux… No, wait… That’s one point twenty one Jigga-watts!!

Kidding aside, if you were to multiply that magnetic field strength by 100, you would have the strength of a typical refrigerator magnet.

Also, the earth’s magnetic field is a few hundred milliGauss, so I wonder if he even compensated for that before the measurement?