The only thing I noticed is that the wheel in the device receives an impulse from the flow of a small current that lasts a few seconds, but when the flow slows down, the inertia of the wheel is everything, it still spins more than the flow. Although I've done my job with raspberries. I think I'll try a flow meter with a more expensive fan drive that's around 90 degrees to the flow, and not like this thing for better accuracy.
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