Sper Scientific 800047 Oxygen Pen - Manual (Page 12)

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BATTERY REPLACEMENT
The low battery icon will appear
on the left side of the LCD to indicate
the need for battery replacement. To
replace:
1. Press POWER to turn the meter off.
2. Rotate the battery cover located on
the bottom of the unit to loosen and
remove.
3. Remove the old batteries and
replace with 4 new AAA 1.5V
batteries, ensuring correct polarity.
4. Replace the battery cover and rotate
to tighten into place.