Testo 0560 1605 605i smartprobe bluetooth thermal hygrometer testo 0560 1605 p the testo 605i thermo hygrometer is perfect for measuring air temperature and relative humidity in rooms and ducts as well as for checking air conditioning system humidifiers p p it wirelessly transmits the measurement data via bluetooth to your own smartphone or tablet and using the testo smart probes app you can view your readings conveniently on your bluetooth device the app also enables the dew point an