The testo 510i differential pressure measuring instrument, used in conjunction with a smartphone or tablet, is suitable for quick and easy measurement of gas flow pressure and static pressure, as well as pressure drops on fans and filters. Turn your smartphone/tablet into a measuring instrument Use your smartphone or tablet as a display: installed on a terminal device, the testo Smart App allows you to view testo 510i readings conveniently and carry out reliable timed and multi-point mean calculation. The App also includes a measurement menu for the pressure drop test. All measurement data can be displayed as a chart or in table form. The measurement data log can be emailed directly as a PDF or Excel file. System requirements: iOS 11 or later Android 6.0 or later Bluetooth 4.0