This is the one I got. It literally saids milliguass right on it.
Anyway, the Torus had a really strong magnetic field even at about 2 feet away. It was high enough where it did not make me feel comfortable. Mu Metal does the trick, it significantly attenuates it, and it's not like mu metal is toxic, so it can only help and it can't harm, absolutely zero brainer. There are other metal alloys like mu metal you can use.
AC Milligauss Meter UHS2
Gauss meter for precise measurement of AC magnetic fieldswww.alphalabinc.com
Simple smartphone data logger app can only do up to 100 Hz, but may be fine for many cases.