How does the Moen Flo Shutoff measure flow rate? Temperature gradient?

This article contains information relevant to the Moen Flo Shutoff, which was formerly known as the Flo Smart Water Monitor and Shutoff system.

This article contains information relevant to the Moen Flo App, which was formerly known as the Moen Smart Water Network app, Moen Smart Water app, Moen app, and Flo by Moen app.

The Moen Flo Shutoff has discrete sensors that directly measure flow rate, pressure and temperature in real time at a scan rate of once every second.