Newland NLS-PT30 User Manual page 24

C. Adjust the reading angle:
The relative pitch angle (the α) with barcode and terminal is less than 45 degrees (0 is the best)
The relative skew angle (the γ) with barcode and terminal is less than 45 degrees (5~20 is the best)
The relative roll angle (the β) with barcode and terminal can be any angles (0~360 degrees).
21