[Toymeister]

Steamlabs uses ultrasound and zip ties on a main pipe. Interior use only. 200.00 on Amazon.

Flume water monitor has been sold by water districts in the arid west to promote conservation. It is also sold directly to consumers. Like Streamlabs it has two parts, a plug in "base" and a battery powered unit that bungee cord straps on the meter in the meter pit by the curb. It doesn't interfere with the meter reads. In fact the meter box isn't opened by the meter readers at all. They use remote sensing technology. Flume is picking up the rotation of the meter as water flows through it. On Amazon for 185.00

Both systems have their advantages. Flume allows you to set a budget and you can see how you are doing against it. Whereas Streamlabs provides a measurement of the gpm, real time. Both provide leak detection. Both work via your home wifi, neither require a subscription.