At the end of the school year, hundreds of student devices come back within a few days. They arrive in waves, class by class, often handed in by students who are already thinking about the holidays. Ticking them off on a printed list is slow, and the list is rarely complete when it is needed.
The questions afterwards are always the same: which devices are back, which cart is each one in, and who still has one at home? Each device already has an asset tag or a serial number barcode. Scanning it on the way into the cart answers those questions without typing.