Walmart has Brinks brand digital timers for $8.73. They only have one on-off setting but they work in minute intervals so its perfect. The price is right also. I've done a lot of playing with the concept for the original topic to this thread, as well as magic's AirDoser and Wasserpest's powerhead method.
I'll start a new thread of my own for further updates.
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Dennis Dietz
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