Acroprint TQ600 (software version 4.x and above) - Manual (Page 18)

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INCORRECT finger positioning:
Tips for improving the quality of finger print reads:
Issue Correction
Dirty or Dry
Finger Clean finger with moisturizing soap or wipe with a
pre-moisturized tissue (alcohol-free wipes
preferably, enriched to hydrate the skin)
Not enough
pressure The user should place finger firmly and flat on the
sensor surface.
How to select
finger?
Use the index or middle finger to enroll; try the left
hand fingers if the right hand fingerprints are
worn, damaged or missing.
If the user’s fingers are small, select the thumb.
How to
position the
finger?
Place finger in the middle of the sensor; keep
finger flat on the sensor and apply pressure while
covering as much of the sensor window as
possible; DO NOT touch the sensor in an angled
or tilted position, DO NOT slide finger.