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I always have the following problem, do you keep the vials attached to the surface of the color chart to make the color estimation (there is shadow in this case and the color gets darker), or you keep the vial in a small distance so much as not to have this shadow interfere with the color of the liquid. Also which of the 2 test would you prefer for NO3 reading? Aquarium Pharmaceuticals one or Sera? Sera gives me a reading of almost 10 ppm higher than Pharmaceuticals. I am confused which is nearest to reality? Ideas? Tests like Lamote or Hack are out of reach here with almost 120 Euros price for each one in the local market.
Thanks in advance
Thanks in advance