Using an oscilloscope and Pico scope spectrum view can give you  more information about what frequencies can be effecting your health. You must use a NFA 100 and a body voltage test together to see how much the electrical fields are coming in on the grounding system which a lot of times is your water pipe in this case 3 amps. Yes 60KHz is often switch mode power supplies or non linear loads.

Yes, the NCB plug with the dial is the thing to use.