Handy and intelligent: the compact differential pressure measuring device testo 510i with professional measuring technology and smartphone operation for measuring differential pressure, air flow velocity, and volumetric flow. You can conveniently read the measurement values via the testo Smart Probes app on your smartphone or tablet and send them directly via email. The testo 510i differential pressure measuring device is ideal for quick and easy measurement of gas flow and static pressure, as well as pressure drops across fans and filters when combined with a smartphone or tablet. Additionally, you can also use the compact testo 510i for flow measurement and volumetric flow measurement. Use your smartphone or tablet as a display: through the testo Smart App installed on the device, you can easily read the measurement values from the testo 510i, quickly and simply configure volumetric flow measurements, and reliably determine time and point averages. The app also includes a measurement menu for pressure drop testing. All measurement data can be displayed either as a graph or in tabular form. Finally, the measurement data report can be sent directly via email as a PDF or Excel file. System requirements: iOS 8.3 or newer, Android 4.3 or newer, Bluetooth 4.0.