1.3 Finger Placement
Recommended fingers: The index finger, middle finger or the ring finger is recommended; the thumb and little finger are not recommended (because they are usually clumsy when pressing on the fingerprint collection screen).

1. Proper finger placement:

The finger must be flat to the surface and centered on the fingerprint sensor.

 2. Improper finger placement:

Not flat to the surface	Offcenter
Slanting	Offcenter