What did I learn by throwing a bottle into my water tank?

If pictures can speak a thousand words, then a gif can certainly do better.
Certainly cheaper than anything else in the market, don’t you think?.
The readout bottle is nearly at the bottom, which implies that water is almost full in the tank.
The probe bottle is at the near top of the tank, which matches the earlier observation
The tank cover has a crack in it, where I can slip by the thread and some extra equipment.

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