Short press to step through T1 internal sensor temperature, Dew Point
temperature, and T1 minus T2 (external probe) temperature
Short press to step through T2 external probe (TP890) temperature, T2
temperature minus Dew Point temperature, and Wet Bulb temperature
Short presses to step through minimum reading, maximum reading, and
to exit. Long press to reset the MIN MAX memories.
Display Description
1. Relative Humidity %
2. T1* (air temperature, internal sensor)
3. T1 temperature minus T2* (optional
external probe TP890) temperature
4. Dew Point* temperature calculation
5. Wet Bulb* temperature calculation
6. T2 temperature minus Dew Point
temperature calculation
7. °C/°F temperature units
8. T2 temperature (optional probe)
9. Maximum reading
10. Minimum reading
11. Low Battery and Data Hold (HLD) icons
*T1 represents the displayed air temperature measured by the internal sensor. T2 represents the
displayed temperature measured by the optional (external) temperature sensor (TP890). Dew
Point and Wet Bulb temperatures are calculations based on T1 air temperature and relative
humidity. T1 minus T2 and T2 minus Dew Point temperature displays are only available when
you connect a TP890 optional temperature probe.
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