I'm looking for a small switch that is sensitive to water, that can rest on
a concrete floor raft, below foor boards which when in contact with a trace
of water (water leak)will 'close' and allow me to connect to an alarm
Any help appreciated.
Don't know whether these US sources will help.
Check with local security/alarm dealers; they sell this sort of stuff.
Perhaps build a switch out of a spring-loaded wooden clothespin, some
nuts and bolts thru the gripping faces, and an aspirin or similar
tablet separating the contacts.
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