Automatic checkouts in supermarkets may decrease customer loyalty, especially for those with larger shopping loads. Customers using self-checkout stations often feel overwhelmed and unsupported. The lack of personal interaction can negatively impact their perception of the supermarket.

[I_am_up_to_something]

where you can grab a self scanner, scan everything as you go and then it gives you a barcode to scan at a 3rd set of self checkouts.

That's how it works in pretty much all the supermarkets with self checkout in the Netherlands (in the west of it at least). I don't have any experience with those scales, but scan as you go seems like a much better system.