Description GM812 series have GM812-S and GM812-L model. The only difference between GM812-S and GM812-L is the lens. GM812-S lens reading distance is 5-30cm. GM812-L lens reading distance is 7-50cm. ...View More
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GROW GM812 Series 1D/2D QR Barcode Scanner Reader DC5V USB/UART Interface For Arduino Windows PDF417 Qr Bar Code Module