Hagen Nutrafin pH Wide Range 4.5 to 9.0 for Fresh and Saltwater, 100-Tests

This test is the simplest to use, of all the tests I have tried. I still use the API Freshwater test kit and find the Hagen test easier to use.

Both tests have a similar problem. If the PH is between 7.0 and 7.5 it is difficult to discern which way it is drifting.

My application, Aquaponics requires PH in the 6.5 to 6.8 range ideally, again; it is difficult to discern which way it is drifting.

I wanted to confirm the accuracy of another brand of liquid pH test kit that I currently use. The Nutrafin test kit registers one degree lower (6.6) than the other brand (7.6). Now I don't know which test kit reading is correct. I gave this 3 stars with the intent of it being a neutral rating.

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