Barcodes count and verification

Hello all, I'm looking to implement a process where I can count how many times a particular barcode label has been scanned. This will help me to verify that all the items that belong to a single unit are leaving the workshop after going through the fabrication and painting process.

Can you think of a process using SmartSheet where: 

- Person A - in charge of fabrication - scans the barcode 15 times - this is the baseline count

- Person B - in charge of painting - scans the barcode 15 times - all the items were received from the fabrication team

- Person B - in charge of shipping - scans all the items and gets a count of 13 - 2 items are missing  - email an alert

Thanks for any help/feedback.