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Title: This Product Does not work...Constant "Err" message
Review: This product initially worked the few times I used it . Then it gave an "Err" message which cannot be cleared. The instructions say that "an 'Err' message will be displayed if the target is not a good ultrasonic reflector...". The target that I aimed at when it WORKED and when it gave the "Err" message was the same. A Drywall!!I even removed the battery to see if it would re-set itself. It will not. Thus, I conclude that this product is poorly designed.
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