Different kinds of Letter board inspection:
Letter board quotes
alphabet Letter board
funny Letter board
Letter board sayings
white Letter board
blank Letter board
black Letter board
Some common factors for letter board quality control:
Appearance
Quantity check
Measurement(weight& size&thickness）
Smell test
Basic function check
3M tape test for Logo
Humidity test
Barcode scanning
Carton dropping test
Words fitting test on letter board
