Negative Positive
Title: unreliable
Review: all i wanted to do is put new shelves in my home office.that's all.but the sensor kept giving false readings.my dad thought i wasn't doing it right. so he tried it, made his marks, drilled the screws, and up the shelf went...and then right down it fell.later, it worked perfectly when i attached my tall bookcase (to the same wall).this sensor is so temperamental.
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