A reader that works on a clean sample label may struggle during a real procedure. Medical device packaging can be glossy, curved, folded, partly obscured, or marked by condensation and handling.
Staff may also need to scan a linear barcode beside a two dimensional symbol, depending on how the Unique Device Identifier is printed.
A useful udi barcode reader should therefore be assessed against the labels, pace, lighting, and software used in the actual department, not only against a demonstration code on a counter.