1) Scanner and bar code cannot be scanned at 90°, and bar code cannot be read normally at 90°. Must be aligned and the scan line is fully wrapped in the barcode.
2) Do not randomly scan the barcode on the manual, otherwise the scanner may not be scanned.
3) During the reading process, for the same batch of barcodes, you will find that the distance between the scanner and the barcode is within a certain range, and the reading success rate will be very high. This distance is the best reading distance.