What type of barcode scanners and weighing scales are supported with WebStore 9.4 application?

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We do not have a list of recommended bar code scanners and weighing scales.
If the device supports a scabar code scanner, then the data captured by the scanner can be translated. With desktop/laptop computers, scanners can send input characters directly to the Store UI without interface code as they work like an input device (like a keyboard).
For mobile devices, scanner interface code may be required if the scanner hardware requires operating system specific code to work with an application. One solution is to write a thin OS specific application wrapper that includes the interface code and an iFrame to load the Web Store application inside.
As for weighing scale integration, there is no code/logic provided out of the box. However, most modern weighing scale devices can work as an input device (like a keyboard) with a USB input. They will typically have a button on the scale itself to "Send Weight" to the computer connected via USB. As long as the focus is on the weight field within the Store application, the weight will be input correctly. There is no need to write any interface code with this type of scale.