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API PH, allows for .2+- differences, it's a little tough when you are in the 7.6-8.0 range because this is the crossover point where the kits overlap, and color differences are hard for me to discern.

My API Nitrate test kit quit reading properly within 2 months of purchase. I found little or no color change between 20-100ppm of nitrates, but, while it worked, it worked good.

I have no experience with tetra tests...
 
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