"KurtG" wrote in message news
Pszemol wrote:
Hanna Instruments electronic colorimeter :-)
Goes down to 0.01 mg/l :-)

Not that it's out of my price range, but I do have a few higher
priorities. I'll just be satisfied that my phosphates are currently
unmeasurable.

It will be hard to find a test which measures reliably below 0.1 mg/l