to trigger a lookup in a return transaction to speed up the return process.

for weighed items, such as prepared foods, and have these bar codes printed on a label or a customer receipt.

for coupon scans so that the POS can recognize a coupon as a form of tender.

for a scale that sends product weight and price information to a master scale third-party application running on the POS server.

for products which are sold in prepackaged format, such as deli meats or cheeses, to provide either the weight of the item or its price.