6 Changing the Batteries
6.1 Battery Replacement Procedure
Batteries should be changed when the 
icon illuminates. The icon will remain lit until the batteries are changed. If the battery power level is too low the Check O2 Plus will not power on until the batteries are changed.
Changing the Batteries
1.Using a #1 Phillips screwdriver loosen the battery door screw A and remove the battery door B.
2.Remove the batteries.
3.Insert new batteries ensuring correct polarity. DO NOT use rechargeable batteries.
4.Replace the battery door and tighten the battery door screw.
5.If the Check O2 Plus does not power on when done verify the batteries are installed correctly and that the batteries are fresh.
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