Water flow meters

[johnic]

I'm looking for a cheap water flow meter that measures in GPH, any one use one and know where to find this...
Thanks

 

[jester805]

I saw one at my LFS last week. I almost bought it, but then I found this head loss calculator. I haven't seen them online anywhere before.

 

[weberian]

I do not believe there is a flow meter on the market that is cheap and accurate. Test by outflowing into a marked 5-gal bucket and using a stopwatch. Then do the math.