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Title: Expired after 3 months
Review: I had the same experience as the previous 1 star user. This was a replacement for the identical product which lasted 7 years. This unit lasted 3 months (it beeped once occasionally even though the test was fine). We replaced the battery, blew compressed air into the unit as is recommended in troubleshooting guides, to no avail. Unfortunately we no longer have the box to return it since it has a 5 year warranty.
