The tonometer automatically monitors and controls the measurement position and
speed of the probe during the measurements, and indicates errors with sounds
and lights. The following table instructs you in error situations and explains what
the different lights and sounds mean. The indicator lights are also presented in the
figure after the table below.
Error light Error
sound
Reason Action
Battery No. Battery is soon
empty.
Prepare to change batteries.
Battery light is ashing No. Battery is empty. Change batteries.
Probe base light is solid red. No. Too much vertical
tilt.
Press the measurement button again to clear the
error message.
Position the tonometer horizontally so that the
probe base light is green.
Probe base light is flashing red
and Measure light turns off.
Two long
beeps.
a) Probe is too far
from or too near
the eye.
b) Probe
movement was not
perpendicular to
the cornea.
Press the measurement button again to clear the
error message.
a) Set the correct distance 4-8mm (5/32-5/16”)
between the probe tip and the center of the cornea.
b) Set the probe perpendicular to the center of the
cornea.
Repeat light is ashing and
Probe base light is ashing red.
Two long
error
beeps.
a) Too much IOP
deviation during
the measurement,
because the user
did not keep the
tonometer stable.
b) Eye was not
recognized.
Press the measurement button again to clear the
error message.
a) Repeat the measurement
b) Do not move the tonometer during the
measurements, remove your hand or fingers from
the infrared transmitters and sensor, move the
patient’s hair away from his/her temple side of the
eye. If the eye still does not get recognized contact
the seller to arrange sending the device for service.
Service light is ashing and
Probe base is ashing red.
Two long
beeps.
Incorrect or dirty
probe or probe
base.
Change the probe, clean or change the probe
base or contact the seller to arrange sending
the device for service.
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