Here's another product we really like because of it’s efficiency and water savings. Introducing the Netafirm Hydrometer. These are a very reliable combination master valve, water meter, and flow sensor.
Highlights include accuracy and saving space by:
Combination master valve, water meter and flow sensor all in one unit
Does not require any upstream or downstream straight pipe for proper function, thus automatically turning off water if there is a valve leak instead of wasting water.