Hey Chocolate..
So in your system, the timer turns on at a predetermined time for a predertimined duration of time.. There is no float switch turning something on to top off. I assume you have a pretty predictable amount of evaporation.
My questions are based on your picture that you posted.
I would think you would almost HAVE to use a digital timer to have the necessary precision and adjustment capabilities, which you don't really have with an analog..
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