It took some doing, scouring eBay for the past few months, but I got me (what I think is) a good flowmeter:
http://cgi.ebay.com/ws/eBayISAPI.dll...tem=3850991548
Specs:
http://www.wbta.us/bigben2k/mn-300n.pdf
(PDF 13 pages, 204k)
http://www.wbta.us/bigben2k/MN-PTF-IOM.pdf
(PDF 12 pages, 141k)
It'll take me some time to set it up, especially since I'll be moving shortly
Anyone know anything else about these?