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Dear Lu,

>�Magnetic deviation when bringing a compass near a light switch may
> have nothing to do with electrical flow.�Instead, depending on the age
> of your house and the building codes in effect, it may be due to either
> metallic sheathing around the wires (BX cable) and/or metal electrical
> boxes holding the switch.

I thought all this is of aluminium. But I will experiment more:-)

> Most stud finders work on the basis of ultrasound.

I like low-tech things (this is one reason why I am on this list:-)
The stud finder I use is a little piece of
metal on a pivot. Similar to a compass needle. It definitely reacts on
iron nails.

Alex.

   

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