One is for scanning bar code with bluetooth. I don't know another one. I use this bar code scanner, and I use it not for business, so if your situation is similar with me, you can also test it.
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I don't know whether you've ever tried Zxing bar code, it's really good. And another one is what I'm using now, it's a java bar code reader.
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I dont't know which barcode generator you were using. But I think maybe your barcode generator don't support this set the size of barcode. I use .net data matrix generate sdk. there are size options, so you can customize the width height and so on.
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