I second this!

Most people who have heard of water sensors know of the moen one. I'm in Canada, and my plumber recommended a Canadian company, Sinope. They were much less expensive and had a sensor in the line and ones you could put in and around appliances that use water.

The in-line flow sensor shuts off the water if it senses abnormal flow anywhere. But the physical sensors shut off the water when it's leaking at that spot.

We've had no leaks, but the flow sensor shut off the water when I filled the kiddie pool and forgot to turn it off. It also cuts short, excessively long showers (that can be turned off).

The safety net is fantastic to have. We can install that freezer ice cube maker without a worry.