Testo 0560 1510 510i smartprobe bluetooth differential pressure gauge testo 0560 1510 p this testo 510i differential pressure measuring instrument is used in conjunction with a smartphone or tablet and is suitable for quick and easy measurement of air and gas flow pressure and static pressure as well as pressure drops on fans and filters p p you can also use the compact testo 510i for flow measurement and volume flow measurement using your smartphone or tablet as a display the testo s