DeFelsko PosiTector DPM v.3.1 Full Manual - Manual (Page 5)

2
USB Port
LCD Display
Probe Connector
PosiTector Body
RH - Relative Humidity (measured)
Ta - Air Temperature (measured)
Ts - Surface Temperature (measured)
Td - Dew Point (calculated)
Ts-Td - Surface minus Dew Point
Temperature (calculated)
Tw - Wet Bulb Temperature (calculated)
(Advanced Models Only)
Typical Screen