Unitech MS100-NTCB00-SG - MS100 Wand Scanner Wand Emulation 9-Pin Squeeze

The MS100 is a wand/pen barcode scanner an ergonomic and compact device best suited for low-volume applications.

It's likely that a wand barcode scanner such as the MS100 offers the best form factor for your application. As the least expensive type of barcode scanner in the market there's a lot to be said about the lasting value of a wand barcode scanner.