ZKTeco F18 User Manual page 13

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(2) 1:1 fingerprint match（User ID＋fingerprint)
Verify the fingerprint pressed on the sensor at present with the
fingerprint related with user number. Use this method when it is difficult
to identify user's fingerprint.
Step 1: Input User ID of employee to be verified on initial interface.
Step 2: Press fingerprint properly on the sensor.
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