Hanna Colorimeters

[sphelps]

mg/L = ppm for pure water only since 1L = 1kg. So your conversion will be off. Personally I would go by the Hanna and deem the other kits inaccurate.

[Magickiwi]

Originally Posted by sphelps

mg/L = ppm for pure water only since 1L = 1kg. So your conversion will be off. Personally I would go by the Hanna and deem the other kits inaccurate.

Fair enough, adding more Rowaphos will only hurt my wallet anyway. I still plan to work out a reference solution some how. My confidence in the measurement is pretty low.

[Kryptic4L]

I really hate my meter, such a pos.

I can get a reading of .28 .13 and 0 all within a few mins of it self.

To be some what accurate you have to use the same vial, and my meter usually turns off before I can get the crap mixed and put it back in.

[sphelps]

why not test RO/DI water? Should be zero right? So if the Hanna tests over it should be pretty obvious.