Testo 605i Thermal Hygrometer
Testo 605i Thermal Hygrometer is a compact probe for measuring air humidity and temperature. It connects to a smartphone or tablet and sends readings directly to the Testo Smart Probes App. As a result, you can view live data and store results with ease.
Designed for use in rooms and ducts, this smart probe helps you check climate conditions quickly. It measures relative humidity from 0 to 100 percent and temperature from -20 to +60 °C. In addition, the app calculates dew point and wet bulb temperature automatically.
Smart App Control
Using Bluetooth, the Testo 605i Thermal Hygrometer links to compatible iOS or Android devices. The app displays clear readings and allows you to save measurement reports. You can also add photos and notes, then send reports by email straight from site.
Data stays organised within the app, which improves workflow and reduces paperwork. Because readings are shown in real time, you can react quickly to changes in air conditions. This makes the instrument ideal for service and maintenance work.
Reliable Sensor Performance
A capacitive humidity sensor delivers stable RH readings across the full measuring range. At the same time, the built in NTC sensor provides accurate temperature values. Together, these sensors support consistent indoor climate checks.
The Testo 605i Thermal Hygrometer runs on three AAA batteries and offers up to 250 hours of battery life. Its slim probe shaft reaches into ducts with ease, while the compact body saves space in your toolkit.














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