605i. Wireless humidity and temperature sensor. For measuring humidity and temperature. Free Bluetooth app. Read measurement values on your phone/tablet. Automatic calculation of dew point and wet temperature. The compact humidity and temperature sensor Testo 605i is included in Testo´s new Smart Probes series and is used in combination with a smartphone or tablet. Suitable for measuring air temperature and relative humidity in rooms and ducts. Together with hot wire sensor Testo 405i, you can also determine heating and cooling performance. Users can comfortably read their measurement values using the free app downloaded to a smartphone or tablet. The app also enables automatic determination of the dew point and wet temperature. All measurement data is presented either in diagram or table form. The measurement results can also be sent directly as PDF or Excel files. Supplied with batteries and a calibration protocol.