Re: "Magnet tamper" for surface mount contact?

[JoeRaisin <joeraisin@xxxxxxxxxxx>]

Matt Ion wrote:

> Bill wrote:
>
>> Using a 3 wire contact (N/O *and* N/C) will make it quite difficult
>> even for
>> the "educated" types to figure out what to do. But then there is still
>> the
>> problem with the magnet. I suppose if the contact is very close to the
>> magnet (tight fitting door), you could remove the back cover from the
>> magnet, glue the magnet to the door, then screw the cover over that. Then
>> they unscrew the magnet, tape it to the contact above, but when they open
>> the door, the magnet glued to the door would open out with the door.
>> So they
>> would just be taping the plastic case to the contact and not the magnet.
>
>
> The advantage to using the recessed contacts is that they can't see
> where the contact is, or even IF it is, so unless they ring the entire
> door with magnets, they'll have a hard time defeating it.

Actually there is a very simple way of finding a recessed door contact.
But trying to defeat it with a magnet could get dicey... get the poles
wrong and you may trip it.