> You don't need scales in the cart.  As the item gets added it talks to the
> server (needs to get the price anyway) and gets the weight.
>
> You weigh the entire cart at checkout.

The problem the scale was tryign to solve was 100 pounds of cheap groceries 
with working RF tags, and burried deep in the middle, an expensive flash 
memory stick with a broken tag.  The weight of the memory stick is far less 
than the tolerance on the food packaging. 


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