Product review (1 stars): DOA
I ordered two of these, ONE showed up in damaged packing.  There's no easy way to get Amazon to fix that sort of issue.  I did get it replaced, and when I went to hook these up, both were DOA, one giving a solid 5v output regardless of connection and the other was very erratic and only giving a small change in reading over a large change in current.  I've used the ACS712 devices on this style board before, and ended up having to use some 30A chips in place of these to get this system out the door.