In article ,
wrote:
I'd avoid reed switches. They're very fussy and tend to fail when used
like this. Also when used as door closed detectors, gusts of wind,
warping etc result in false alarms too.

I've got reed switches on every window and external door. Fitted years
ago. Not ever had a problem. Sound like they weren't correctly installed.

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*Why do the two "sanction"s (noun and verb) mean opposites?*

Dave Plowman London SW
To e-mail, change noise into sound.