This proposal is for a design quickly buildable from off-the-shelf parts.
Power 12 Vdc
Input normally open push buttons or relays: (1) reset (2) count
Output LCD: (1) six decimal digits (2) UPC-A style bar code
I'm new to Freelancer.com. If I misunderstood your request, please do let me know.
Peace
--Devon
P.S. Options which might affect cost and time include
* enclosure
* IR remote input
* QR instead of UPC
* battery-friendly power supply
* custom rigid or flexible printed circuit CAD files
* fabricated, tested and shipped from ShenZhen, China