I'm sure there are at least a couple of apps that would allow you to scan multiple items and save the numbers to a file of some kind. You could then take that file and cross reference it with your inventory database.
I saw some of them just wasn't sure if they phone can do something like that, im planning on purchasing bar code labels for the items in storage that way I can tag everything that comes in and out of the warehouse and have it in our database with its description oh and thanks for the link
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A barcode scanner is only something which is installed between your keyboard and workstation. That way it doesn't matter if you enter the code by hand or using the scanner: you click in the field which needs the code to be entered to get the focus on it, next you scan your code. The only problem might be that after scan there's no automatic submit, so you need to click a button then.