It's actually an interesting problem to solve. You would think that a particular item weighs the same no matter which store you scan it in, but in reality item

It's actually an interesting problem to solve. You would think that a particular item weighs the same no matter which store you scan it in, but in reality item weight can vary. Sometimes it is due to the manufacturer changing the packaging or adding a free sample of some other product to the item, but more interesting it could be the region. One chain I worked in had issues w/self-checkout on paper items such as toilet paper, paper towels, etc. The items were all weighed in the home office in Massachusetts and input into the master item file. This worked fine in most of the stores. The stores in Florida however always had issues because, due to the humidity in the air, the paper would absorb some of that and be just heavier enough to trip the scales. Eventually it was fixed by adding a larger weight variance allowance to the southern stores' POS registers.