User`s guide

Page 12
Calibration
Unsuccessful Calibration
If several consecutive attempts at checking the calibration are unsuccessful:
Loosen or remove the Ocu-Film Tip Cover from the TONO-PEN XL probe tip and
repeat the calibration check.
If still unsuccessful:
Spray the probe tip with compressed gas, and repeat the calibration check.
If still unsuccessful:
Replace the batteries and repeat the calibration check.
Note: If [CAL] appears followed by a row of four dashes [- - - -], the unit did not go into
calibration mode. To correct this, depress the button quicker two times or slower two
times (see step 2 of calibration procedure).
Note: Do not take measurements with the instrument if two consecutive [good] calibration
checks cannot be obtained. The instrument will not take a measurement when the prior
calibration check was [bAd].
Note: If the TONO-PEN XL fails to yield a [Good] calibration, call Reichert Technical
Service.