MSI Plessey: The Grocery Store Workhorse

MSI Plessey (or Modified Plessey) is a numeric-only barcode symbology developed primarily for retail inventory management.

1. Inventory Control focus

While you won't see MSI Plessey on product packaging, you will see it on the shelf edges of supermarkets. It is used by handheld scanners for stock-taking, price checking, and reordering stock from the warehouse.

2. Check Digit Reliability

Because accurate inventory data is vital, MSI Plessey often uses one or even two check digits (Mod 10 or Mod 11) to ensure the data captured is 100% correct.