Sper Scientific 850007 Visible Light SD Card Logger - Manual (Page 31)

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BATTERY REPLACEMENT
This meter uses six AA (1.5 V, UM3)
batteries. When the low battery
indicator appears on the LCD,
battery replacement is needed. After
the icon appears on the LCD, in-spec
measurement can still be made for
several hours before becoming
inaccurate.
1. Press and hold POWER for 2
seconds to turn the meter off.
2. Unscrew the battery cover and
remove from the meter.
3. Remove the old batteries and
replace with six new AA batteries,
ensuring correct polarity.
4. Replace the battery cover.
Tighten the screws on the battery
cover to secure to the meter.