Sper Scientific 800036 WBGT Heat Stress Meter - Manual (Page 10)

LCD DISPLAY
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% Relative Humidity
The percentage of water vapor in the air.
IN/OUT Indoor/Outdoor
Environment with or without direct sun exposure using the following
equations:
Indoor/Outdoor (No Sun): WBGT=0.7 WB + 0.3 TG
Outdoor (Full Sun): WBGT=0.7 WB + 0.2 TG + 0.1 TA
C/F Celsius/Fahrenheit
Ambient temperature in either Celsius or Fahrenheit .
The low battery icon indicates that you must replace the batteries.
Low Battery Indicator
DP/REC/888
These indicators are reserved for use in future models. Please
disregard.
Unused
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BATTERY REPLACEMENT
1. When the meter displays the low battery icon,
press the SET button to turn the unit off.
2. Open the battery compartment on the
back of the unit.
3. Remove the old batteries and replace them with
2 new AAA batteries. Replace the compartment
cover.
Battery life is greater than 1000 hours when
using alkaline batteries (250 hours when using
general purpose batteries).