Testo, Inc. products

Precise, reliable measurement of all air velocity and IAQ parameters with just one measuring instrument – the testo 440 dP. This multifunction measuring instrument is intuitive and easy to use, thanks to its integrated differential pressure sensor and clearly structured measurement menus. Adjusting air conditioning and ventilation systems, monitoring air quality, and carrying out comfort level measurements are all possible without the hassle of juggling different devices and tools. Enjoy the versatility of using your choice of high quality digital probes with just one measuring instrument.