A low-restriction low-cost flow meter monitored via the motherboard, scaled in the order of 1000RPM (at the mobo fan header) = 1LPM, would have many water-cooling enthusiasts chomping at the bit to buy one.
It is, I would warrant, the one device which many people express a desire for, for which there is yet to be an acceptable low-cost low-restriction solution for.
I have no idea how many people would buy one (as in how large the market is) but almost world-wide in various cooling forums I see perhaps 2 threads a week from people that ask for such a thing.
Just my 2c. I'd buy one in a heartbeat.
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