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Smart Thermal Hygrometer Product Details: The compact humidity measuring instrument testo 605i, in combination with a smartphone or tablet, is suitable for the measurement of air temperature and relative humidity in rooms and ducts. It can also be used to determine the cooling and heating performance together with the thermal anemometer testo 405i. Features: Compact professional measuring instrument for use with smartphones/tablets Measurement of air humidity and temperature in rooms and ducts Automatic calculation of dewpoint and wet bulb temperature via testo Smart Probes App Measurement data analyzed and sent via testo Smart Probes App