Welch Allyn SureSight Autorefractor - User Manual - Manual (Page 29)

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Service and Warranty
SureSight Rechargeable Battery
Welch Allyn Lithium Ion batteries are warranted by Welch Allyn for two years from
date of manufacture (when used in Welch Allyn instruments only). Defective
batteries will be replaced on a pro rata basis should failure occur prior to
expiration date on battery.
Calibration and Maintenance
When the calibration symbol is shown, it indicates that it has been 18
months since the unit was last calibrated. It is recommended that you
send the unit in for re-calibration.
Welch Allyn recommends that the SureSight be recalibrated annually.
Arrangements may be made by returning the SureSight registration card or by
contacting Welch Allyn’s Technical Service Department. A moderate fee is
charged for re-calibration.
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