The AirPro Thermohygrometer Straight Probe Model TH-S measures temperature and relative humidity while enabling the calculation of wet bulb and dew point temperatures through the AirPro software. It directly attaches to the AirPro Velocity Meter AP500 or via stackable probes for extended measurements. Although designed exclusively for wireless applications, the AirPro Measurement Probes do not compromise on the high reliability, accuracy, and overall performance customers have come to expect from TSI.