I have a couple whisper sensors monitoring my lawn and drip system.   I understand how they can monitor the soil in my lawn but I’m wonder how the whisper works on my drip system as it doesn’t see the moisture that’s added to the soil(the emitter isolates the water to the plant) or the rate the plants use it like the one in the lawn does.  I’m assuming it’s just estimating like the Netro would on it’s own.  Is there much value to using a whisper on a drip zone?

I have two zones for the grass in my backyard and want to connect 1 whisper for both zones since its one small piece of grass.  How can I do this?