The SonTek FlowTracker 2 (FT2) handheld Acoustic Doppler Velocimeter (ADV®) is a wading discharge measurement instrument that is handheld, portable and precise. We know our users love and trust the technology with the original FlowTracker, but we wanted more! The FlowTracker2 now comes with functional, modernized features such as Bluetooth, GPS, and a large color screen, to name only a few. The enhancements came directly from the evaluation and feedback from hydrologists, researchers, and scientists who have made the FlowTracker their instrument of choice.