Use UV printer to print the "#" word for the 10 times at the same place, after all printed out with 40 times the magnifying glass to see whether they coincide. If they don't coincide, indicating that there are problems in the uv printer's alignment accuracy, if all coincide, indicating that uv printer's alignment accuracy is high, and we can also confirm that whether the printed word are clear or not, if there is ghosting, indicating that there is vibration in the operation of the uv printer, which will result in the error when printing.
