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Inaccurate pressure
The outer edges of the fluorescein rings touch each
other
(27)
Pressure is too strongly reduced.
Increase the pressure by turning
the measuring drum.
The fluorescein rings coincide and form a line
(28)
The pressure is reduced.
Increase the pressure by turning
the measuring drum.
The fluorescein rings do not touch each other
(29)
The pressure is too strongly increased.
Reduce the pressure by turning
the measuring drum.
Correct position!
(30)
The inner edges of the fluorescein rings touch each other.
27
28
29
30