TOPIC: Well Water Testing

I live a semi-rural area with lots of wells and I need to add well water testing to my services.  I've found a good lab for coliform and FHA testing, but my main concern is testing the flow.  I've done a lot a research online and talked to a couple of different people and it seems everybody does something different.  I have a TORO pressure/flow gauge and I understand how to use it, but does anyone out there have any tips on the most proper way to test flow?  I'm open to any suggestions.

Thanks

Paddy the toro or any-other flow tester attached to hose bib are pretty much the same operation start the water of easy and slowly increase to max, how many do you go through a year flow gauges