I made a simple emf reader with a portable radio. Your just turn the dial to where there is no station, and bring close to whatever you are testing. You won't get a "reading", but you will get various amounts of noise. My hp 930 printer screamed, even when shut off. I now regularily unplug them until I am ready to use them. Also unplugged is all my sound equipment. Off just isn't good enough. For my phones the radiations seemed to go up rather than sideways.
Now I hate to even use my electric piano. May ditch it and get the old fashioned kind.