User`s guide

Page 11
Calibration Procedure
The TONO-PEN VET unit is internally calibrated, thus the instrument calibration
should be checked only before the rst use each day or in the event of unanticipated
readings. Calibration must be routinely and successfully performed once daily prior
to instrument use. Calibration should also be performed whenever it is indicated by
the LCD display, when batteries are replaced, or after an unsuccessful calibration. It
is not necessary to check calibration prior to each use:
Point the transducer end of the TONO-PEN straight down towards the oor
(see Figure 5a).
Depress the Operator’s Button two times rapidly. The time between the rst
and second button press must be between 0.5 and 1.5 seconds. The TONO-
PEN will “beep” and display CAL.
Wait approximately 15 seconds for the TONO-PEN to “beep”. The display will
change from CAL to UP.
Immediately (within 1 second) invert the TONO-PEN smoothly, pointing the
transducer end straight up (see Figure 5b).
A properly functioning TONO-PEN will display Good followed by a “beep”.
Repeat this Calibration Procedure if bAd is displayed.
After Good is displayed, depress the Operator’s Button one time and the
TONO-PEN will display [8.8.8.8], followed by a single row of dashes, [- - - -],
and then by a double row of dashes [====] followed by a “beep” tone, indicat-
ing the instrument is ready to measure IOP (Depressing the activation button
a second time will interrupt this process and send the unit into calibration
mode).
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Calibration
Figure 5a
Figure 5b