The Testo 605i thermo-hygrometer is a humidity and temperature smart probe that quickly and accurately measures relative humidity, dew point, and temperature in rooms, ducts, registers, and environmental chambers. Users read measurements using the Testo Smart Probes App on Android or Apple smart devices with Bluetooth 4.0.

The Testo Smart Probes App allows remote readings from up to six Testo smart probes simultaneously, displaying data as instrument readings, tables, or graphs. Measurements can be saved as PDF or Excel files, and custom reports can be created and shared by email. Accuracy: humidity ±(1.8% RH + 3% of m.v.) at 77°F, temperature ±1.4°F (-4 to 32°F) / ±0.9°F (32 to 140°F). Automatically calculates dew point and wet bulb temperature.