ScanAvenger - Wireless Barcode Scanner, QR Code Reader
Barcode scanning - Material Design
The original Barcode Scanner app is getting review-bombed with malware accusations - The Verge
Amazon.com : Zebra DS9208-SR Omni-Directional Presentation Barcode Scanner (2D, 1D, QR Code, Postal and Mobile Phones Barcode), Comes with Heavy-Duty Shielded 7-Foot USB Cable (CBA-U21-S07ZAR) : Office Products
Scan a QR code with your iPhone, iPad, or iPod touch - Apple Support