Where can I find a flow meter that is compatible with my Rachio 2?

I have a Rachio 2 and do not want to replace it with a Rachio 3.

What flow meters are compatible with my Rachio 2 (to be clear, which flow meters can be connected directly to my Rachio 2 so that it can read the values of my flow meter and make better watering decisions?)

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Torro is compatible, creative sensors technology is compatible.