The Testo 605-H2 (0560 6054) Stick Thermo-Hygrometer is capable of precise measurements of air humidity and air temperature, as well as calculations of wet bulb temperature. The testo 605-H2 is ideally suited for duct measurements, due to its slim form factor and ability to be read from multiple angles, with a rotatable probe. With its long term, resilient, Testo patented sensor, the testo 605-H2 thermal hygrometer can provide correct air humidity, air temperature, and wet bulb calculations for in-duct and ambient conditions. The rotating cap will further protect the sensor from dirt and impact, ensuring reliable measurements for years.