Sper Scientific 800037 WBGT Heat Stress SD Card Logger - Manual (Page 23)

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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 POWER 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.