@Makersworkbench, have you tested to verify the 3% accuracy, and if so, over what flow range? That's very good for such an inexpensive meter. And could you post Seeed studio link for those forum discussions. We've looked around a bunch for inexpensive meters like this, and the one you have, and also a couple available from Jaycar, seem to be about it. Next step up is over US$200.
If you're also driving a pump, you may be able to use voltage to the pump to measure flow and leave out the meter; as long as your hydraulic loop doesn't change. See our work here: Riparian Rap
thanks,
Steve