Extech Instruments HT30 User Manual page 3

CONTROL BUTTONS
Short press to switch ON or OFF.
To access the WBGT alarm set point: Switch OFF the meter and
then long press the SET button for 2 seconds.
Simultaneously press MODE and NEXT to toggle temperature units.
Press NEXT, when changing the alarm set point, to move to the next
digit.
Long press NEXT to return to normal operation after setting the
WBGT alarm.
Short press to select a mode of operation.
Long press to toggle indoor (IN) and outdoor (OUT) use.
The up arrow button is used when setting the WBGT alarm set point.
DISPLAY SYMBOLS
Symbol
WBGT
TG
TA
RH%
OUT
IN
C/F
#NAS100230; r. AA/99106/99106; en-US
Function
Wet Bulb Globe temperature
Black Globe temperature
Air temperature
Relative humidity
Outdoor use
Indoor use
Temperature units
Low battery indicator
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