Costco says its new member ID scanners at entrances are good for business — and shoppers too

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• Costco installed ID scanners at more than half of its US warehouses and says the system is working.
• CEO Ron Vachris said the devices help things run more smoothly — for the company and its customers.
• The company also said members have largely shrugged off the latest increase to the annual fee.

Costco's ID scanners appear to be a hit.

The devices, which were introduced in the US earlier this year, are now active in approximately 350 warehouses across the country ...