I am debating whether to continue to rent them or to sell one or both of them. 

We get paid the same whether you take a higher rate or buy down, but there are absolutely times when it makes more sense to do it one way or another.

Also, you didnt mention any financing costs, was this built with cash or do you roll that into your cost of construction?

There's so many options but they all do the same thing (more or less).

I'm not a lawyer or anything and don't have any experience with the ones I've wrote in the past in court. 

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To boost income, consider mid-term rentals (travel nurses, corporate stays), renting by the room, or adding value with minor renovations.

Has anyone used this device or have another recommendation to monitor water usage? 

Will the renting of ADU rise to the level of trade or business? 

Are you still working the 9-5 job or retired?