Home assistant cheap pool sensor?

Hello!

I moving to a new home with a small pool and I was thinking of buying a pool sensor.

Right now I'm searching for something simple like temperature but would be nice to have ph and others.

I'd like it to be local, no cloud, and right now something cheap, I love DIY stuff.

So, any recommendations? Any experiences with these kind of sensors? My searches lead to pretty expensive stuff that can measure all the pool parameters and cloud based.

Thanks for reading!