In our company, I installed it on a Windows tablet (Dell Venue Pro) with Rugged Case and for faster scanning, we used a Motorolla ds3578 handheld scanner (that was 5 years ago).  Currently planning to upgrade using a Microsoft surface go/go 2 with a MobileDemand Mil Specs cover but if an android or IOS option is available then it would be great. 

Also, I haven't tested the built-in camera of current phone/tablets if the performance will be acceptable when used to scan QR code outdoors thus eliminating the requirement for a separate scanner.

Our workaround with regards to the quantity issue is that we create 1 item for each.

                         Item                               QTY

800x800 Rectangular Duct                   1
800x800 Rectangular Duct                   1

Disadvantage is if you have 100 pcs the same item then you will have a very long list.