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Useful reads on warehouses, stock counts and audits.
What a barcode is and how it is readA pattern of thin and thick bars becomes a number, and the number links to an item in your database.
What the digits of an EAN-13 meanEach group in the 13 digits has a job: prefix, company, item and check digit.
UPC vs EAN: what is the differenceUPC-A has 12 digits and EAN-13 has 13. Modern scanners read both.
Code 128: a practical code for warehouse labelsIt packs letters, digits and symbols compactly, so it is popular for internal labels.
Code 39: outdated or still usefulSimple and reliable, but wide. You still meet it in older systems.
QR codes in the warehouse: when they beat barcodesQR is handy when you need more data or phone scanning; for simple counting a linear code is enough.