Hagen makes a reasonably-priced one. You can get one he
http://www.drsfostersmith.com/produc...=6&pCatId=4469

Jody

"SLEngst" wrote in message
...
I need a brand name and source for an effective PO4 measuring kit. My
current
one seems to be measuring well water, tested by a commercial lab as having
no
PO4 as having 0.1 - 0.3 ppm, which has sure thrown me off. I would
appreciate
suggestions of kits that are accurate and cheaper than my La Motte NO3
kit.
Thanks in advance,
Sharon Engstrom