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Hanna Phosphorus Ultra Low Range
Used in 81 aquariums
on December 28, 2018
Love this thing, just picked up the new ppm version. Finally no dealing with color matching.
on January 18, 2017
For the $$ it's ok. It rates itself at .04 +- accuracy. Dont know about you if youre trying to keep PO4 between .00 and .03 thats out it accuracy. I test multiple times to get an average of the readings.