An elongated, flexible, flat conductive tape can be applied to any surface to be monitored for water or other liquid leaks, and electrically connected to any suitable type of conventional electrically operated leak detector. A pair of parallel spaced conductors is disposed on one side of the tape that...http://www.google.com.hk/patents/US6175310?utm_source=gb-gplus-share專利 US6175310 - Leak detection tape
