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Title: Failed repeatedly - DO NOT BUY
Review: I bought this sensor about a year ago and used it once. It worked great. The next time I went to use it, about six months later, it beeped constantly, even when it was no where near a wall. I replaced the battery and it still is malfunctioning. I am very disappointed with this unit. The warrantly is expired now, but by the time I payed to ship it back, etc. it is hardly worth it.
