I've seen that flow-"meter" on an european website. Glad to see it's here in the USA! But I surely won't pay $40 for one.
I highly doubt that it is accurate for measurement, but it is definitely good for sensing wether or not there is flow. I don't think that the RPM can actually be equated with flow, but I could be wrong. There's no info on this.
It is driven by magnetic field, magnets being imbedded in the impeller. It also has 0.2" ID connections, which means that it would impede flow, especially with 1/2" ID tubing (0.5").
$40? I don't think so... I'm still searching.
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