Title: I understand the negative reviews, but it worked for me.
Product review: I looked around and it seems like everyone is selling the same wrench. I can see that the bits are roughly made and the wrench seems to have a lot of rattling, and the adjustments are not smooth. But, it worked for me. There are no instructions but it is not difficult to figure out. If you are handy enough to consider changing your own watch battery, you are handy enough to use this tool without too much trouble. By the way, it came in a plastic case with all of the parts.
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