UEi Test Instruments THL2 - Manual (Page 6)

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*To save power, the logger’s LED flashing-cycle can be changed to 20 or
30 seconds via the supplied software.
**To save power alarm LED’s for temperature and humidity can be
disabled via the supplied software.
***When both temperature and relative humidity readings exceed the
alarm levels the LED status indication alternate every cycle. For example if
there is only one alarm cycle the “REC” LED will blink for one cycle, and
the Alarm LED status will blink on the next cycle. If there are two alarms
the “REC” LED will be disabled and the two alarms will alternate on each
cycle.
****When the battery is low all operations will be disabled automatically.
NOTE: Logging will automatically stop if the battery level is low (logged
data will be retained). The software is required to download data and
restart logging.
*****To delay logger start, use the software and select “MANUAL”
instead of “INSTANT”. This is available from the “LINK” menu and
then “LOGGER SET”, or by clicking on the computer icon on the Logger
Software task bar. If you select “MANUAL” the logger will not begin
logging until you press the yellow button on the logger housing.